Carbamyloxy compounds which inhibit leukocyte adhesion mediated by VLA-4

ABSTRACT

Disclosed are compounds which bind VLA-4. Certain of these compounds also inhibit leukocyte adhesion and, in particular, leukocyte adhesion mediated by VLA-4. Such compounds are useful in the treatment of inflammatory diseases in a mammalian patient, e.g., human, such as asthma, Alzheimer&#39;s disease, atherosclerosis, AIDS dementia, diabetes, inflammatory bowel disease, rheumatoid arthritis, tissue transplantation, tumor metastasis and myocardial ischemia. The compounds can also be administered for the treatment of inflammatory brain diseases such as multiple sclerosis.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of application Ser. No. 09/126,958, filed Jul. 31, 1998, now U.S. Pat. No. 6,489,300, which claims the benefit of U.S. Provisional Application No. 60/112,020, which was converted pursuant to 37 C.F.R. § 1.53(c)(2)(i) from U.S. patent application Ser. No. 08/904,424, filed Jul. 31, 1997; and U.S. Provisional Application No. 60/054,453, filed Aug. 1, 1997, which applications are incorporated herein by reference in their entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to compounds which inhibit leukocyte adhesion and, in particular, leukocyte adhesion mediated by VLA-4.

References

The following publications, patents and patent applications are cited in this application as superscript numbers:

¹Hemler and Takada, European Patent Application Publication  No. 330,506, published August 30, 1989 ²Elices, et al., Cell, 60:577-584 (1990) ³Springer, Nature, 346:425-434 (1990) ⁴Osborn, Cell, 62:3-6 (1990) ⁵Vedder, et al., Surgery, 106:509 (1989) ⁶Pretolani, et al., J. Exp. Med., 180:795 (1994) ⁷Abraham, et al., J. Clin. Invest., 93:776 (1994) ⁸Mulligan, et al., J. Immunology, 150:2407 (1993) ⁹Cybulsky, et al., Science, 251:788 (1991) ¹⁰Li, et al., Arterioscler. Thromb., 13:197 (1993) ¹¹Sasseville, et al., Am. J. Path., 144:27 (1994) ¹²Yang, et al., Proc. Nat. Acad. Science (USA), 90:10494  (1993) ¹³Burkly, et al., Diabetes, 43:529 (1994) ¹⁴Baron, et al., J. Clin. Invest., 93:1700 (1994) ¹⁵Hamann, et al., J. Immunology, 152:3238 (1994) ¹⁶Yednock, et al., Nature, 356:63 (1992) ¹⁷Baron, et al., J. Exp. Med., 177:57 (1993) ¹⁸van Dinther-Janssen, et al., J. Immunology, 147:4207 (1991) ¹⁹van Dinther-Janssen, et al., Annals. Rheumatic Dis., 52:672  (1993) ²⁰Elices, et al., J. Clin. Invest., 93:405 (1994) ²¹Postigo, et al., J. Clin. Invest., 89:1445 (1991) ²²Paul, et al., Transpl. Proceed., 25:813 (1993) ²³Okarhara, et al., Can. Res., 54:3233 (1994) ²⁴Paavonen, et al., Int. J. Can., 58:298 (1994) ²⁵Schadendorf, et al., J. Path., 170:429 (1993) ²⁶Bao, et al., Diff., 52:239 (1993) ²⁷Lauri, et al., British J. Cancer, 68:862 (1993) ²⁸Kawaguchi, et al., Japanese J. Cancer Res., 83:1304 (1992) ²⁹Kogan, et al., U.S. Pat. No. 5,510,332, issued April 23,  1996 ³⁰International Patent Appl. Publication No. WO 96/01644

All of the above publications, patents and patent applications are herein incorporated by reference in their entirety to the same extent as if each individual publication, patent or patent application was specifically and individually indicated to be incorporated by reference in its entirety.

2. State of the Art

VLA-4 (also referred to as α4β1 integrin and CD49d/CD29), first identified by Hemler and Takada¹ is a member of the β1 integrin family of cell surface receptors, each of which comprises two subunits, an α chain and a β chain. VLA-4 contains an α4 chain and a β1 chain. There are at least nine β1 integrins, all sharing the same β1 chain and each having a distinct α chain. These nine receptors all bind a different complement of the various cell matrix molecules, such as fibronectin, laminin, and collagen. VLA-4, for example, binds to fibronectin. VLA-4 is unique among β₁ integrins in that it also binds non-matrix molecules that are expressed by endothelial and other cells. These non-matrix molecules include VCAM-1, which is expressed on cytokine-activated human umbilical vein endothelial cells in culture. Distinct epitopes of VLA-4 are responsible for the fibronectin and VCAM-1 binding activities and each activity has been shown to be inhibited independently.²

Intercellular adhesion mediated by VLA-4 and other cell surface receptors is associated with a number of inflammatory responses. At the site of an injury or other inflammatory stimulus, activated vascular endothelial cells express molecules that are adhesive for leukocytes. The mechanics of leukocyte adhesion to endothelial cells involves, in part, the recognition and binding of cell surface receptors on leukocytes to the corresponding cell surface molecules on endothelial cells. Once bound, the leukocytes migrate across the blood vessel wall to enter the injured site and release chemical mediators to combat infection. For reviews of adhesion receptors of the immune system, see, for example, Springer³ and Osborn⁴.

Inflammatory brain disorders, such as experimental autoimmune encephalomyelitis (EAE), multiple sclerosis (MS) and meningitis, are examples of central nervous system disorders in which the endothelium/leukocyte adhesion mechanism results in destruction to otherwise healthy brain tissue. Large numbers of leukocytes migrate across the blood brain barrier (BBB) in subjects with these inflammatory diseases. The leukocytes release toxic mediators that cause extensive tissue damage resulting in impaired nerve conduction and paralysis.

In other organ systems, tissue damage also occurs via an adhesion mechanism resulting in migration or activation of leukocytes. For example, it has been shown that the initial insult following myocardial ischemia to heart tissue can be further complicated by leukocyte entry to the injured tissue causing still further insult (Vedder et al.⁵). Other inflammatory conditions mediated by an adhesion mechanism include, by way of example, asthma⁶⁻⁸, Alzheimer's disease, atherosclerosis⁹⁻¹⁰, AIDS dementia¹¹, diabetes¹²⁻¹⁴ (including acute juvenile onset diabetis), inflammatory bowel disease¹⁵ (including ulcerative colitis and Crohn's disease), multiple sclerosis¹⁶⁻¹⁷, rheumatoid arthritis¹⁸⁻²¹, tissue transplantation²², tumor metastasis²³⁻²⁸, meningitis, encephalitis, stroke, and other cerebral traumas, nephritis, retinitis, atopic dermatitis, psoriasis, myocardial ischemia and acute leukocyte-mediated lung injury such as that which occurs in adult respiratory distress syndrome.

In view of the above, assays for determining the VLA-4 level in a biological sample containing VLA-4 would be useful, for example, to diagnosis VLA-4 mediated conditions. Additionally, despite these advances in the understanding of leukocyte adhesion, the art has only recently addressed the use of inhibitors of adhesion in the treatment of inflammatory brain diseases and other inflammatory conditions^(29,30). The present invention addresses these and other needs.

SUMMARY OF THE INVENTION

This invention provides compounds which bind to VLA-4. Such compounds can be used, for example, to assay for the presence of VLA-4 in a sample and, in pharmaceutical compositions to inhibit cellular adhesion mediated by VLA-4, for example, binding of VCAM-1 to VLA-4. The compounds of this invention have a binding affinity to VLA-4 as expressed by an IC₅₀ of about 15 μM or less (measured as described in Example A below) which compounds are defined by formula I below:

wherein

R¹ is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocylic, heteroaryl and substituted heteroaryl;

R² is selected from the group consisting of hydrogen, alkyl, cycloalkyl, substituted cycloalkyl, cycloalkenyl, substituted cycloalkenyl, heterocyclic, substituted heterocyclic, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, and R¹ and R² together with the nitrogen atom bound to R² and the SO₂ group bound to R¹ can form a heterocyclic or a substituted heterocyclic group;

R³ is selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic and, when R² does not form a heterocyclic group with R¹, R² and R³ together with the nitrogen atom bound to R² and the carbon atom bound to R³ can form a heterocyclic or a substituted heterocyclic group;

R⁵ is —(CH₂)_(x)—Ar—R^(5′) where R^(5′) is selected from the group consisting of —O-Z-NR⁸R^(8′) and —O-Z-R¹² wherein R⁸ and R^(8′) are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocyclic, and where R⁸ and R^(8′) are joined to form a heterocycle or a substituted heterocycle, R¹² is selected from the group consisting of heterocycle and substituted heterocycle, and Z is selected from the group consisting of —C(O)— and —SO₂—,

Ar is aryl, heteroaryl, substituted aryl or substituted heteroaryl,

x is an integer of from 1 to 4;

Q is —C(X)NR⁷— wherein R⁷ is selected from the group consisting of hydrogen and alkyl; and X is selected from the group consisting of oxygen and sulfur;

and pharmaceutically acceptable salts thereof.

In another embodiment, the compounds of this invention can also be provided as prodrugs which convert (e.g., hydrolyze, metabolize, etc.) in vivo to a compound of formula I above. In a preferred example of such an embodiment, the carboxylic acid group of the compound of formula I is modified into a group which, in vivo, will convert to a carboxylic acid group (including salts thereof). In a particularly preferred embodiment, such prodrugs are represented by compounds of formula IA:

wherein

R¹ is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocylic, heteroaryl and substituted heteroaryl;

R² is selected from the group consisting of hydrogen, alkyl, cycloalkyl, substituted cycloalkyl, cycloalkenyl, substituted cycloalkenyl, heterocyclic, substituted heterocyclic, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, and R¹ and R² together with the nitrogen atom bound to R² and the SO₂ group bound to R¹ can form a heterocyclic or a substituted heterocyclic group;

R³ is selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic and, when R² does not form a heterocyclic group with R¹, R² and R³ together with the nitrogen atom bound to R² and the carbon atom bound to R³ can form a heterocyclic or a substituted heterocyclic group;

R⁵ is —(CH₂)_(x)—Ar—R^(5′) where R^(5′) is selected from the group consisting of —O-Z-NR⁸R⁸ and —O-Z-R¹² wherein R⁸ and R^(8′) are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocyclic, and where R⁸ and R^(8′) are joined to form a heterocycle or a substituted heterocycle, R¹² is selected from the group consisting of heterocycle and substituted heterocycle, and Z is selected from the group consisting of —C(O)— and —SO₂—,

Ar is aryl, heteroaryl, substituted aryl or substituted heteroaryl,

x is an integer of from 1 to 4;

R⁶ is selected from the group consisting of 2,4-dioxo-tetrahydrofuran-3-yl (3,4-enol), amino, alkoxy, substituted alkoxy, cycloalkoxy, substituted cycloalkoxy, —O—(N-succinimidyl), —NH-adamantyl, —O-cholest-5-en-3-β-yl, —NHOY where Y is hydrogen, alkyl, substituted alkyl, aryl, and substituted aryl, —NH(CH₂)_(p)COOY where p is an integer of from 1 to 8 and Y is as defined above, —OCH₂NR⁹R¹⁰ where R⁹ is selected from the group consisting of —C(O)-aryl and —C(O)-substituted aryl and R¹⁰ is selected from the group consisting of hydrogen and —CH₂COOR¹¹ where R¹¹ is alkyl, and —NHSO₂Z′ where Z′ is alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic;

Q is —C(X)NR⁷— wherein R⁷ is selected from the group consisting of hydrogen and alkyl; and X is selected from the group consisting of oxygen and sulfur;

and pharmaceutically acceptable salts thereof

with the following provisos

(A) when R¹ and R² together with the SO₂ group pendent to R¹ and the nitrogen pendent to R² form a saccharin-2-yl group, R³ is —CH₃, R⁵ is p-[(CH₃)₂NC(O)O—]benzyl and Q is —C(O)NH— then R⁶ is not —OC(CH₃)₃;

(B) when R¹ is p-methylphenyl, R² and R³ together with the nitrogen atom pendent to R² and the carbon atom pendent to R³ form a pyrrodinyl ring derived from D-proline; R⁵ is p-[(4-methylpiperazin-1-yl)NC(O)O—]benzyl derived from D-phenylalanine and Q is —C(O)NH— then R⁶ is not —OC(CH₃)₃;

(C) when R¹ is pyrimidin-2-yl, R² and R³ together with the nitrogen atom bound to R² and the carbon atom bound to R³ form a pyrrolidinyl ring, R⁵ is p-[(CH₃)₂NC(O)O—]benzyl and Q is —C(O)NH— then R⁶ is not —OC(CH₃)₃.

(D) when R¹ is p-methylphenyl, R² and R³ together with the nitrogen atom pendent to R² and the carbon atom pendent to R³ form a (2S)-piperazin-2-carbonyl ring; R⁵ is p-[(CH₃)₂NC(O)O—]benzyl and Q is —C(O)NH— then R⁶ is not —OC(CH₃)₃.

Preferably, in the compounds of formula I and IA above, R¹ is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heterocyclic, substituted heterocylic, heteroaryl and substituted heteroaryl. Even more preferably R¹ is selected from the group consisting of methyl, isopropyl, n-butyl, benzyl, phenethyl, phenyl, 4-methylphenyl, 4-t-butylphenyl, 2,4,6-trimethylphenyl, 2-fluorophenyl, 3-fluorophenyl, 4-fluorophenyl, 2,4-difluorophenyl, 3,4-difluorophenyl, 3,5-difluorophenyl, 2-chlorophenyl, 3-chlorophenyl, 4-chlorophenyl, 3,4-dichlorophenyl, 3,5-dichlorophenyl, 3-chloro-4-fluorophenyl, 4-bromophenyl, 2-methoxyphenyl, 3-methoxyphenyl, 4-methoxyphenyl, 3,4-dimethoxyphenyl, 4-t-butoxyphenyl, 4-(3′-dimethylamino-n-propoxy)-phenyl, 2-carboxyphenyl, 2-(methoxycarbonyl)phenyl, 4-(H₂NC(O)—)phenyl, 4-(H₂NC(S)—)phenyl, 4-cyanophenyl, 4-trifluoromethylphenyl, 4-trifluoromethoxyphenyl, 3,5-di-(trifluoromethyl)phenyl, 4-nitrophenyl, 4-aminophenyl, 4-(CH₃C(O)NH—)phenyl, 4-(PhNHC(O)NH—)phenyl, 4-amidinophenyl, 4-methylamidinophenyl, 4-(CH₃SC(═NH)—)phenyl, 4-chloro-3-(H₂NS(O)₂—)phenyl, 1-naphthyl, 2-naphthyl, pyridin-2-yl, pyridin-3-yl, pyrimidin-2-yl, quinolin-8-yl, 2-(trifluoroacetyl)-1,2,3,4-tetrahydroisoquinolin-7-yl, morpholin-4-yl, 2-thienyl, 5-chloro-2-thienyl, 2,5-dichloro-4-thienyl, 1-N-methylimidazol-4-yl, 1-N-methylpyrazol-3-yl, 1-N-methylpyrazol-4-yl, 1-N-butylpyrazol-4-yl, 1-N-methyl-3-methyl-5-chloropyrazol-4-yl, 1-N-methyl-5-methyl-3-chloropyrazol-4-yl, 2-thiazolyl and 5-methyl-1,3,4-thiadiazol-2-yl.

Preferably, in the compounds of formula I and IA above, R² is hydrogen, methyl, phenyl, benzyl, —(CH₂)₂-2-thienyl, and —(CH₂)₂-φ.

In one embodiment, R¹ and R² together with the nitrogen atom bound to R² and the SO₂ group bound to R¹ are joined to form a heterocyclic group or substituted heterocyclic group. Preferred heterocyclic and substituted heterocyclic groups include those having from 5 to 7 ring atoms having 2 to 3 heteroatoms in the ring selected from the group consisting of nitrogen, oxygen and sulfur which ring is optionally fused to another ring such as a phenyl or cyclohexyl ring to provide for a fused ring heterocycle of from 10 to 14 ring atoms having 2 to 4 heteroatoms in the ring selected from the group consisting of nitrogen, oxygen and sulfur. Specifically preferred R¹/R² joined groups include, by way of example, benzisothiazolonyl (saccharin-2-yl), N-2,10-camphorsultamyl and 1,1-dioxo-2,3-dihydro-3,3-dimethyl-1,2-benzisothiazol-2-yl.

In one preferred embodiment, R² and R³ together with the nitrogen atom bound to R² substituent and the carbon bound to the R³ substituent form a heterocyclic group or a substituted heterocyclic group of 4 to 6 ring atoms having 1 to 2 heteroatoms in the ring selected from the group consisting of nitrogen, oxygen and sulfur which ring is optionally substituted with 1 to 2 substituents selected from the group consisting of fluoro, methyl, hydroxy, oxo (═O), amino, phenyl, thiophenyl, thiobenzyl, (thiomorpholin-4-yl)C(O)O—, CH₃S(O)₂— and CH₃S(O)₂O—, or can be fused to another ring such as a phenyl or cycloalkyl ring to provide for a fused ring heterocycle of from 10 to 14 ring atoms having 1 to 2 heteroatoms in the ring selected from the group consisting of nitrogen, oxygen and sulfur. Such heterocyclic rings include azetidinyl (e.g., L-azetidinyl), thiazolidinyl (e.g., L-thiazolidinyl), piperidinyl (e.g., L-piperidinyl), piperazinyl (e.g., L-piperazinyl), dihydroindolyl (e.g., L-2,3-dihydroindol-2-yl), tetrahydroquinolinyl (e.g., L-1,2,3,4-tetrahydroquinolin-2-yl), thiomorpholinyl (e.g., L-thiomorpholin-3-yl), pyrrolidinyl (e.g., L-pyrrolidinyl), substituted pyrrolidinyl such as 4-hydroxypyrrolidinyl (e.g., 4-α-(or β-)hydroxy-L-pyrrolidinyl), 4-oxopyrrolidinyl (e.g., 4-oxo-L-pyrolidinyl), 4-fluoropyrrolidinyl (e.g., 4-α-(or β-)fluoro-L-pyrrolidinyl), 4,4-difluoropyrrolidinyl (e.g., 4,4-difluoro-L-pyrrolidinyl), 4-(thiomorpholin-4-ylC(O)O—)pyrrolidinyl (e.g., 4-α-(or β-)-(thiomorpholin-4-ylC(O)O—)-L-pyrrolidinyl, 4-(CH₃S(O)₂O—)pyrrolidinyl (e.g., 4-α-(or β-)(CH₃S(O)₂O—)-L-pyrrolidinyl, 3-phenylpyrrolidinyl (e.g., 3-α-(or β-)phenyl-L-pyrrolidinyl), 3-thiophenylpyrrolidinyl (e.g., 3-α-(or β-)-thiophenyl-L-pyrrolidinyl), 4-aminopyrrolidinyl (e.g., 4-α-(or β-)amino-L-pyrrolidinyl), 3-methoxypyrrolidinyl (e.g., 3-α-(or β-)methoxy-L-pyrrolidinyl), 4,4-dimethylpyrrolidinyl, substituted piperazinyl such as 4N-Cbz-piperazinyl and 4-(CH₃S(O)₂—)piperazinyl, substituted thiazolidinyl such as 5,5-dimethylthiazolindin-4yl, 1,1-dioxo-thiazolidinyl (e.g., L-1,1-dioxo-thiazolidin-2-yl), substituted 1,1-dioxo-thiazolidinyl such as L-1,1-dioxo-5,5-dimethylthiazolidin-2-yl, 1,1-dioxothiomorpholinyl (e.g., L-1,1-dioxo-thiomorpholin-3-yl) and the like.

Preferably, in the compounds of formula I and IA above, R³ includes all of the isomers arising by substitution with methyl, phenyl, benzyl, diphenylmethyl, —CH₂CH₂—COOH, —CH₂—COOH, 2-amidoethyl, iso-butyl, t-butyl, —CH₂O-benzyl and hydroxymethyl. Additionally, in another preferred embodiment, R³ and R² together with the nitrogen atom bound to R² can form a heterocyclic group or substituted heterocyclic group.

Q is preferably —C(O)NH— or —C(S)NH—.

Ar is preferably aryl or substituted aryl and, even more preferably, is phenyl or substituted phenyl. Preferably, x is 1.

R⁵ is preferably selected from all possible isomers arising by substitution with the following groups:

3-[(CH₃)₂NC(O)O—]benzyl,

4-[(CH₃)₂NC(O)O—]benzyl,

4-[(CH₃)₂NS(O)₂O—]benzyl,

4-[(piperidin-1′-yl)C(O)O—]benzyl,

4-[(piperidin-4′-yl)C(O)O—]benzyl,

4-[(1′-methylpiperidin-4′-yl)C(O)O—]benzyl,

4-[(4′-hydroxypiperidin-1′-yl)C(O)O—]benzyl,

4-[(4′-formyloxypiperidin-1′-yl)C(O)O—]benzyl,

4-[(4′-ethoxycarbonylpiperidin-1′-yl)C(O)O—]benzyl,

4-[(4′-carboxylpiperidin-1′-yl)C(O)O—]benzyl,

4-[(3′-hydroxymethylpiperidin-1′-yl)C(O)O—]benzyl,

4-[(4′-hydroxymethylpiperidin-1′-yl)C(O)O—]benzyl,

4-[(4′-phenyl-1′-Boc-piperidin-4′-yl)-C(O)O—]benzyl,

4-[(4′-piperidon-1′-yl ethylene ketal)C(O)O—]benzyl,

4-[(piperazin-4′-yl)-C(O)O—]benzyl,

4-[(1′-Boc-piperazin-4′-yl)-C(O)O—]benzyl,

4-[(4′-methylpiperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-methylhomopiperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-(2-hydroxyethyl)piperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-phenylpiperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-(pyridin-2-yl)piperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-(4-trifluoromethylpyridin-2-yl)piperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-(pyrimidin-2-yl)piperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-acetylpiperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-(phenylC(O)—)piperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-(pyridin-4-ylC(O)—)piperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-(phenylNHC(O)—)piperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-(phenylNHC(S)—)piperazin-1′-yl)C(O)O—]benzyl,

4-[(4′-methanesulfonylpiperazin-1′-yl-C(O)O—)benzyl,

4-[(4′-trifluoromethanesulfonylpiperazin-1′-yl-C(O)O—)benzyl,

4-[(morpholin-4′-yl)C(O)O—]benzyl,

3-nitro-4-[(morpholin-4′-yl)-C(O)O—]benzyl,

4-[(thiomorpholin-4′-yl)C(O)O—]benzyl,

4-[(thiomorpholin-4′-yl sulfone)-C(O)O—]benzyl, (alternative nomenclature 4-[(1,1-dioxothiomorpholin-4yl)-C(O)O—]benzyl),

4-[(pyrrolidin-1′-yl)C(O)O—]benzyl,

4-[(2′-methylpyrrolidin-1′-yl)C(O)O—]benzyl,

4-[(2′-(methoxycarbonyl)pyrrolidin-1′-yl)C(O)O—]benzyl,

4-[(2′-hydroxymethyl)pyrrolidin-1′-yl)C(O)O—]benzyl,

4-[(2′-(N,N-dimethylamino)ethyl)(CH₃)NC(O)O—]benzyl,

4-[(2′-(N-methyl-N-toluene-4-sulfonylamino)ethyl)(CH₃)N—C(O)O—]benzyl,

4-[(2′-(morpholin-4′-yl)ethyl)(CH₃)NC(O)O—]benzyl,

4-[(2′-(hydroxy)ethyl)(CH₃)NC(O)O—]benzyl,

4-[bis(2′-(hydroxy)ethyl)NC(O)O—]benzyl,

4-[(2′-(formyloxy)ethyl)(CH₃)NC(O)O—]benzyl,

4-[(CH₃OC(O)CH₂)HNC(O)O—]benzyl,

4-[2′-(phenylNHC(O)O-)ethyl-]HNC(O)O—]benzyl,

3-chloro-4-[(CH₃)₂NC(O)O—]benzyl,

3-chloro-4-[(4′-methylpiperazin-1′-yl)C(O)O—]benzyl,

3-chloro-4-[(4′-(pyridin-2-yl)piperazin-1′-yl)C(O)O—]benzyl,

3-chloro-4-[(thiomorpholin-4′-yl)C(O)O—]benzyl, and

3-fluoro-4-[(CH₃)₂NC(O)O—]benzyl.

In another embodiment, R⁵ is selected to form dimeric compounds of the formula:

wherein each R¹, R² and R³ is as defined herein; Y is OH or R⁶, where R⁶ is as defined herein; and A is a divalent group of the formula:

wherein each R^(a) is independently selected from the group consisting of alkylene and substituted alkylene; each R^(b) is independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl, substituted aryl, cycloalkyl, substituted cyclalkyl, cycloalkenyl, substituted cycloalkenyl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic; and pharmaceutically acceptable salts thereof. Preferably, R^(a) is ethylene (i.e., —CH₂CH₂—).

In the compounds of formula IA, R⁶ is preferably 2,4-dioxo-tetrahydrofuran-3-yl (3,4-enol), methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, t-butoxy, cyclopentoxy, cyclopropylmethoxy, neopentoxy, 2-α-isopropyl-4-β-methylcyclohexoxy, 2-β-isopropyl-4-β-methylcyclohexoxy, 2-methoxyphenoxy, 2-(morpholin-4-yl)ethoxy, —O(CH₂CH₂O)₂CH₃, 2-(phenoxy)ethoxy, —OCH₂C(CH₃)₂NHBoc, —NH₂, benzyloxy, —NHCH₂COOH, —NHCH₂CH₂COOH, —NH-adamantyl, —NHSO₂-p-CH₃-φ, —NHCH₂CH₂COOCH₂CH₃, —NHOY′ where Y′ is hydrogen, methyl, iso-propyl or benzyl, O—(N-succinimidyl), —O-cholest-5-en-3-β-yl, —OCH₂—OC(O)C(CH₃)₃, —O(CH₂)_(z)NHC(O)W where z is 1 or 2 and W is selected from the group consisting of pyrid-3-yl, N-methylpyridyl, and N-methyl-1,4-dihydro-pyrid-3-yl, —NR″C(O)—R′ where R′ is aryl, heteroaryl or heterocyclic and R″ is hydrogen or CH₂C(O)OCH₂CH₃.

Preferred compounds within the scope of formula I and IA above include by way of example:

-   -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         ethyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         ethyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         n-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         cyclopentyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         n-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         cyclopentyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(isonipecotoyloxy)phenylalanine         ethyl ester     -   N-(α-toluenesulfonyl)-L-prolyl-L-4-(N-methylisonipecotoyloxy)phenylalanine         ethyl ester     -   N-(α-toluenesulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-3-(N,N-dimethylcarbamyloxy)phenylalanine         ethyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(1-tert-butylcarbonyloxy-4-phenylpiperidin-4-ylcarbonyloxy)phenylalanine         ethyl ester     -   N-(toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-[(1,1-dioxo)thiamorpholin-3-carbonyl]-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-[(1,1-dioxo)thiamorpholin-3-carbonyl]-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)sarcosyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)sarcosyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)sarcosyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylaminosulfonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylaminosulfonyloxy)phenylalanine     -   N-(1-methylimidazole-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-aminobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)sarcosyl-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(α-toluenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(piperazin-2-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(α-toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         N-adamantyl amide     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanylglycine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylaminosulfonyloxy)phenylalanine         methyl ester     -   N-(toluene-4-sulfonyl)-L-(piperazin-2-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(4-benzyloxycarbonylpiperazin-2-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)sarcosyl-L-4-(isonipecotoyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-[(1,1-dioxo)thiamorpholin-3-carbonyl]-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-[(1,1-dioxo)thiamorpholin-3-carbonyl]-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine     -   N-(1-methylpyrazole-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)sarcosyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(1,1dioxo-5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(1-methylimidazole-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   2-(saccharin-2-yl)propionoyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxo-5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(pyridine-3-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-D-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-N-methylalanyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-nitrobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-[(1,1-dioxo)thiamorpholin-3-carbonyl]-L-4-(N,N-dimethylaminosulfonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)sarcosyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-N-methylalanyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(isonipecotoyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(pyrrolidin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         neopentyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         neopentyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-tert-butyloxycarbonylpiperazin-1-ylcarbonyloxy)phenylalanine         ethyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine         ethyl ester     -   2-(saccharin-2-yl)propionoyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   2-(saccharin-2-yl)propionoyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)sarcosyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)sarcosyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-N-methylalanyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)sarcosyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-N-methylalanyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(pyridine-3-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(pyrimidine-2-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-nitrobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-cyanobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylaminosulfonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxo)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxo)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(piperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(1-tert-butyloxycarbonylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(piperazin-1-ylcarbonyloxy)phenylalanine         ethyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-acetylpiperazin-1-ylcarbonyloxy)phenylalanine         ethyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-methanesulfonylpiperazin-1-ylcarbonyloxy)phenylalanine         ethyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(morpholin-4-ylcarbonyloxy)-3-nitrophenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(1-tert-butyloxycarbonylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-N-methyl-2-(tert-butyl)glycinyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-prolyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-prolyl-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-trifluoromethoxybenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester

3-[N-(toluene-4-sulfonyl)-N-methylamino]-1-[1-tert-butyloxycarbonyl-2-(N,N-dimethylcarbamyloxy)phenylethyl]azetidine

-   -   N-(4-fluorobenzenesulfonyl)-L-(1,1-dioxo-5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxo-5,5-dimethyl)thiaprolyl-L-4-(N,N-methylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(pyrimidine-2-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester

3-[N-(toluene-4-sulfonyl)-N-methylamino]-1-[1-carboxy-2-(N,N-dimethylcarbamyloxy)phenylethyl]azetidine

-   -   N-(1-methylpyrazole-4-sulfonyl)-L-prolyl-L-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(1,1-dioxo)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(isonipecotoyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(pyrrolidin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(1,1-dioxo)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(2,5-dichlorothiophene-3-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-acetamidobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-tert-butylbenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(pyridine-2-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(2-fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(3-fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(2,4-difluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-acetamidobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-trifluoromethoxybenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-cyanobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(3,3-dimethyl)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(3,3-dimethyl)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-propyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         iso-propyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N-(1,4-dioxa-8-aza-spiro[4.5]decan-8-yl)carbonyloxy)phenylalanine         ethyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N-(1,4-dioxa-8-aza-spiro[4.5]decan-8-yl)carbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4′-acetylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4′-methanesulfonylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4′-phenylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(piperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   2-saccharin-2-yl)propionyl-L-4-(4′-methylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4′-methanesulfonylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         (N′-tert-butoxycarbonyl-2-amino-2-methylpropyl) ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4′-acetylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4′-hydroxypiperidin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene         sulfonyl)-L-propyl-L-4-(N-(2′-(morpholin-4′-yl)ethyl)carbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N-(1,4-dioxa-8-aza-spiro[4.5]decan-8-yl)carbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N-(2′-hydroxyethyl)-N-methylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl(4′-(2-hydroxyethyl)piperazin-1-ylcarbonyloxy)-L-phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N-(2′-formyloxyethyl)-N-methylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N-(2′-hydroxyethyl)-N-methylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toulene-4-sulfonyl)-L-prolyl-L-4-(N-(methoxycarbonylmethyl)carbamyloxy)phenylalanine         tert-butyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-(4-N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4′-methoxypiperidin-1-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4′-methoxypiperidin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-4-oxoprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-trans-4-hydroxyprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(3-fluorobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(morpholino-sulfonyl)-L-prolyl-L-(4-N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(morpholino-sulfonyl)-L-prolyl-L-(4-N,N-dimethylcarbamyloxy)phenylalanine     -   N-(1-methylpyrazole-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(2-fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(2,4-difluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(pyridine-3-sulfonyl)-L-(5,5-dimethyl-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3-fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(1-methylpyrazole-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-tert-butylbenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-(3,3-dimethyl)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(2,5-dichlorothiophene-3-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-methoxybenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-methoxybenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-(1-oxo-thiomorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(1-oxo-thiomorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(3,4-difluorobenzenesulfonyl)-L-prolyl-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3,4-difluorobenzenesulfonyl)-L-prolyl-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(3,4-difluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(3,4-difluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-(thiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         ethyl ester     -   N-(pyridine-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(pyridine-2-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(pyridine-2-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(pyridine-2-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(pyridine-2-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(2-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3,4-difluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3,5-difluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(2,4-difluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(4-chlorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3-chlorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(2-chlorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3,4-dichlorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3,5-dichlorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3-chlorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(3,4-dichlorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-methoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3-methoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(2-methoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3,4-dimethoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(2,4-difluorobenzenesulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(3,4-dichlorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(3-chlorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(3-chloro-4-fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(3,4-difluorobenzenesulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(5,5-dimethyl)thioprolyl-L-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(3,4-difluorobenzenesulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(2,5-dichlorothiophene-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(8-quinolinesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(8-quinolinesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(8-quinolinesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isoproplyl ester     -   N-(8-quinolinesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-phenylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4′-(ethoxycarbonyl)piperidin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(pyridine-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(3-sulfonamido-4-chloro-benzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-(1-oxothiomorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(2,4-difluorobenzenesulfonyl)-L-(1-oxothiomorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         2,2-dimethylpropyl ester     -   N-(pyridine-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         2,2-dimethylpropyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         cyclopropylmethyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         methyl ester     -   N-(pyridine-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         ethyl ester     -   N-(pyridine-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         cyclopropylmethyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         2-methoxyphenyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         n-butyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         n-propyl ester     -   N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         2,2-dimethylpropionyloxymethyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N-(4′-(2′-aminoethyl)morpholino)carbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-[4-(carboxy)piperidin-1-ylcarbonyloxy]phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-bis-(2-hydroxyethyl)carbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-[3-(hydroxymethyl)piperidin-1-ylcarbonyloxy]phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-trifluoromethanesulfonylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-(N-phenylurea)benzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(2-trifluoroacetyl-1,2,3,4-tetrahydroisoquinolin-7-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(1-methylpyrazole-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(1-methylpyrazole-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(pyridine-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(pyridine-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(5,5-methyl)thiaprolyl-L-4-(N-methyl-N-(2-dimethylaminoethyl)carbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N-methyl-N-(2-dimethylaminoethyl)carbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(5,5-dimethyl)thiapropyl-L-4-(N-methyl-N-(2-dimethylaminoethyl)carbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N-methyl-N-(2-dimethylaminoethyl)carbamyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(N,N-dimethylcarbamyloxy)]phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-methylpiperazin-1-ylcarbonyloxy)]phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-3-chloro-4-(N,N-dimethylcarbamyloxy)]phenylalanine         isopropyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-(2′-pyridyl)-piperazin-1-ylcarbonyloxy)]phenylalanine         isopropyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-(2′-pyridyl)-piperazin-1-ylcarbonyloxy)]phenylalanine         tert-butyl ester     -   N-(4-nitrobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(4-aminobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-phenylcarbamylpiperazin-1-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-phenylcarbamylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(1-n-butylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(pyridin-4-ylcarbonyl)piperazin-1-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-4-oxoprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-trans-4-hydroxyprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-cyanobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(4-aminobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-4-oxoprolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-[3-(hydroxymethyl)piperidin-1-ylcarbonyloxy]phenylalanine     -   N-(toluene-4-sulfonyl)-L-(4,4-difluoro)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-(4,4-difluoro)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-(4-benzoylpiperazin-1-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(1-methyl-1H-imidazole-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-4-(thiomorpholin-4-ylcarbonyloxy)prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(4-cyanobenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(4-amidinobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         methyl ester     -   N-(toluene-4-sulfonyl)-L-4-oxoprolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-4-hydroxyprolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-(4-benzoylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(4-amidinobenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         methyl ester     -   N-(3-fluorobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-[N-methyl-N-(2-(N′-methyl-N′-toluenesulfonyl-amino)ethyl)carbamyloxy]phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-[N-(2-(N′-phenylaminocarbonyloxy)ethyl)carbamyloxy)]phenylalanine         isopropyl ester     -   N-(4-fluorobenzenesulfonyl)-L-4-(trans-hydroxy)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(4-fluorobenzenesulfonyl)-L-4-(trans-hydroxy)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-amidinobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   piperazine-1,4-dicarboxylic acid         bis-{4-[(2S)-2-tert-butoxycarbonyl-2-((4R)-5,5-dimethyl-3-(toluene-4-sulfonyl)thiazolidine-4-carboxamido)ethyl]phenyl}ester     -   piperazine-1,4-dicarboxylic acid         bis-{4-[(2S)-2-carboxy-2-((4R)-5,5-dimethyl-3-(toluene-4-sulfonyl)thiazolidine-4-carboxamido)ethyl]phenyl}ester     -   N-(toluene-4-sulfonyl)-L-(pyrazin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(2-hydroxymethylpyrrolidin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(2-hydroxymethylpyrrolidin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(2-methoxycarbonylpyrrolidin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)]phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)]phenylalanine         tert-butyl ester     -   piperazine-1,4-dicarboxylic acid         bis-{4-[(2S)-2-isopropoxycarbonyl-2-((2R)-1-(toluene-4-sulfonyl)pyrrolidine-2-carboxamido)ethyl]phenyl}ester     -   N-(toluene-4-sulfonyl)-L-(4-hydroxy)prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         2-(2-methoxyethoxy)ethyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyrimidyl)piperazin-1-ylcarbonyloxy)]phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-fluoro-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(toluene-4-sulfonyl)-L-(1-methanesulfonylpyrazin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-[2-(1,1-dioxo-2,3-dihydro-3,3-dimethyl-1,2-benzisothiazol-2-yl)acetyl]-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-[2-(N-2,10-camphorsultamyl)acetyl]-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-[2-(N-2,10-camphorsultamyl)acetyl]-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-[2-(N-2,10-camphorsultamyl)acetyl]-L-3-chloro-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(4-bromobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-bromobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(4-hydroxy)prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyrimidyl)piperazin-1-ylcarbonyloxy)]phenylalanine     -   piperazine-1,4-dicarboxylic acid         bis-{4-[(2S)-2-tert-butoxycarbonyl-2-((2R)-1-(toluene-4-sulfonyl)pyrrolidine-2-carboxamido)ethyl]phenyl}ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)]phenylalanine         isopropyl ester     -   N-(4-fluorobenzenesulfonyl)thiazolidinyl-2-carbonyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)thiazolidinyl-2-carbonyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(4-oxo)prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-(4-oxo)prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)thiazolidinyl-2-carbonyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)]phenylalanine     -   N-(4-nitrobenzenesulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)]phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)thiazolidinyl-2-carbonyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)]phenylalanine         tert-butyl ester     -   N-(4-bromobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)]phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-(N-phenylthiocarbonyl)piperazin-1-ylcarbonyloxy)]phenylalanine         isopropyl ester     -   N-(4-fluorobenzenesulfonyl)thiazolidinyl-2-carbonyl-L-4-(4-methylhomopiperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   piperazine-1,4-dicarboxylic acid         bis-{4-[(2S)-2-carboxyl-2-((2R)-1-(toluene-4-sulfonyl)pyrrolidine-2-carboxamido)ethyl]phenyl}ester     -   N-(toluene-4-sulfonyl)-L-4-(methanesulfonyloxy)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-aminocarbonylbenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-aminocarbonylbenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(4-amidinobenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine     -   N-(4-nitrobenzenesulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)]phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)]phenylalanine         ethyl ester     -   N-(4-fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)thiazolidinyl-2-carbonyl-L-4-(4-methylhomopiperazin-1-ylcarbonyloxy)phenylalanine     -   N-(1-methylpyrazole-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(1-methylimidazole-4-sulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(1-methylimidazole-4-sulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(4-fluorobenzenesulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(4-fluorobenzenesulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(toluene-4-sulfonyl)-L-(1-methanesulfonylpyrazin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(toluene-4-sulfonyl)-L-4-(methanesulfonyloxy)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(methanesulfonyl)-N-benzylglycinyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-bromobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-trifluoromethoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(4-trifluoromethoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         tert-butyl ester     -   N-(4-trifluoromethoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(4-fluorobenzenesulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine     -   N-(4-fluorobenzenesulfonyl)-L-(4-hydroxy)prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine     -   N-(4-trifluoromethoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine     -   N-(1-methylimidazole-4-sulfonyl)-L-prolyl-L-3-chloro-4-(N,N-dimethylcarbamyloxy)phenylalanine     -   N-(1-methylimidazole-4-sulfonyl)-L-prolyl-L-3-chloro-4-(N,N-dimethylcarbamyloxy)phenylalanine         isopropyl ester     -   N-(1-methylimidazole-4-sulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine     -   N-(1-methylimidazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine     -   N-(1-methylpyrazole-3-sulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine     -   N-(1-methylpyrazole-3-sulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(1-methylpyrazole-3-sulfonyl)-L-prolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(1-methylpyrazole-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         tert-butyl ester     -   N-(1-methylimidazole-4-sulfonyl)-L-prolyl-L-3-chloro-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         isopropyl ester     -   N-(1-methylpyrazole-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine         2-phenoxyethyl ester     -   N-(1-methylpyrazole-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine     -   N-(1-methylpyrazole-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-(2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine         ethyl ester     -   N-(3-chloro-1,5-dimethylpyrazole-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-(5-trifluoromethyl-2-pyridyl)piperazin-1-ylcarbonyloxy)phenylalanine     -   and pharmaceutically acceptable salts thereof as well as any of         the ester compounds recited above wherein one ester is replaced         with another ester selected from the group consisting of methyl         ester, ethyl ester, n-propyl ester, isopropyl ester, n-butyl         ester, isobutyl ester, sec-butyl ester, tert-butyl ester and         neopentyl ester.

This invention also provides methods for binding VLA-4 in a biological sample which method comprises contacting the biological sample with a compound of formula I or IA above under conditions wherein said compound binds to VLA-4.

Certain of the compounds of formula I and IA above are also useful in reducing VLA-4 mediated inflammation in vivo.

This invention also provides pharmaceutical compositions comprising a pharmaceutically acceptable carrier and a therapeutically effective amount of one or more of the compounds of formula I or IA above with the exception that R³ and R⁵ are derived from L-amino acids or other similarly configured starting materials (alternatively racemic mixtures can be used).

The pharmaceutical compositions may be used to treat VLA-4 mediated disease conditions. Such disease conditions include, by way of example, asthma, Alzheimer's disease, atherosclerosis, AIDS dementia, diabetes (including acute juvenile onset diabetis), inflammatory bowel disease (including ulcerative colitis and Crohn'disease), multiple sclerosis, rheumatoid arthritis, tissue transplantation, tumor metastasis, meningitis, encephalitis, stroke, and other cerebral traumas, nephritis, retinitis, atopic dermatitis, psoriasis, myocardial ischemia and acute leukocyte-mediated lung injury such as that which occurs in-adult respiratory distress syndrome.

Accordingly, this invention also provides methods for the treatment of an inflammatory disease in a patient mediated by VLA-4 which methods comprise administering to the patient the pharmaceutical compositions described above.

Preferred compounds of formula I and IA above include those set forth in Table I below:

TABLE IA

R¹ R² R³ R⁵ R^(6′) p-CH₃-φ R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OCH₂CH₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂CH₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —O-n-butyl 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —O-cyclopentyl 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —O-n-butyl 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —O-cyclopentyl 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(piperidin-4-yl)C(O)O-]benzyl- —OCH₂CH₃ 3 carbon atoms (L-pyrrolidinyl) φ-CH₂- R²/R³ = cyclic p-[(1-methylpiperidin-4-yl)C(O)O-]benzyl- —OCH₂CH₃ 3 carbon atoms (L-pyrrolidinyl) φ-CH₂- R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic m-[(CH₃)₂NC(O)O-]benzyl- —OCH₂CH₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(1-Boc-4-phenylpiperidin-4-yl)- —OCH₂CH₃ 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂— p-CH₃-φ R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂— p-CH₃-φ CH₃— H p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ p-CH₃-φ CH₃— H p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ p-CH₃-φ CH₃— H p-[(CH₃)₂NC(O)O-]benzyl- —OH p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NS(O)₂O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²/R³ = cyclic p-[(CH₃)₂NS(O)₂O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) 1-methylimidazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ yl 3 carbon atoms (L-pyrrolidinyl) p-NH₂-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- CH₃— H p-[(morpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ p-CH₃-φ- R²/R³ = cyclic p-[(morpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) φ-CH₂- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH₂—NH—CH₂- (L-piperizinyl) φ-CH₂- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂— p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —NH-adamantyl 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —NHCH₂C(O)OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[CH₃S(O)₂NH-]benzyl- —OCH₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—NH—CH₂- (L-piperizinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂- (Cbz)NHCH₂- [L-4-N-(Cbz)- piperizinyl] p-CH₃-φ- CH₃— H p-[(piperidin-1-yl)C(O)O-]benzyl- —OH p-CH₃-φ- R²/R³ = cyclic p-[(morpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ- R²/R³ = cyclic p-[(morpholin-4-yl)C(O)O-]benzyl- —OH —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ yl- 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- —CH₃ H p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—SO₂—C(CH₃)₂- (L-1,1-dioxo-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH yl- 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—SO₂—C(CH₃)₂- (L-1,1-dioxo-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) 3-pyridyl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (D-pyrrolidinyl) p-CH₃-φ- —CH₃ —CH₃ p-[4-methylpiperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ p-nitro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NS(O)₂O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ- —CH₃ H p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ p-CH₃-φ- —CH₃ —CH₃ p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OH p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl sulfone)- —OH 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(piperidin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(pyrrolidin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(morpholin-4-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OCH₂C(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂C(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(1-Boc-piperazin-4-yl)C(O)O-]benzyl- —OCH₂CH₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(morpholin-4-yl)C(O)O-]benzyl- —OCH₂CH₃ 3 carbon atoms (L-pyrrolidinyl) R¹/R² = —CH₃ p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ saccharin-2-yl- R¹/R² = —CH₃ p-[(CH₃)₂NC(O)O-]benzyl- —OH saccharin-2-yl- p-CH₃-φ- —CH₃ H p-[(thiomorpholin-4-yl sulfone)- —OC(CH₃)₃ C(O)O-]benzyl- p-CH₃-φ- —CH₃ H p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OH p-CH₃-φ- —CH₃ —CH₃ p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—S—CH₂- (L-thiomorpholin-3- yl) p-CH₃-φ- —CH₃ H p-[thiomorpholin-4-yl sulfone)- —OH C(O)O-]benzyl- p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ- R²/R³ = cyclic p-[(morpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ- —CH₃ —CH₃ p-[(CH₃)₂NC(O)O-]benzyl- —OH p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—S—CH₂- (L-thiomorpholin-3- yl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) pyridin-3-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-nitro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-N≡C-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NS(O)₂O-]benzyl- —OH —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—SO₂—CH₂- (L-1,1- dioxothiazolidin-4-yl) p-F₃C-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH yl- 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—SO₂—CH₂- (L-1,1- dioxothiazolidin-4-yl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—S—CH₂- (L-thiazolidin-4-yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- 2,4-dioxo- 3 carbon atoms tetrahydrofuran-3- (L-pyrrolidinyl) yl (3,4-enol) p-CH₃-φ- R²/R³ = cyclic p-[(piperazin-4-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(1-Boc-piperazin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(piperazin-4-yl)C(O)O-]benzyl- —OCH₂CH₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-acetylpiperazin-1-yl)C(O)O-]benzyl- —OCH₂CH₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-methanesulfonylpiperazin-1-yl)- —OCH₂CH₃ 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic 3-nitro-4-[(morpholin-4-yl)- —OH 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(1-Boc-piperazin-4-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- —CH₃ —C(CH₃)₃ p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic p-[(1,1-dioxothiomorpholin-4-yl)- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- C(O)O-]benzyl- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ- R²/R³ = cyclic p-[(1,1-dioxothiomorpholin-4-yl)- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- C(O)O-]benzyl- (L-1,1- dioxothiomorpholin- 3-yl) p-F-φ- R²/R³ = cyclic p-[(1,1-dioxothiomorpholin-4-yl)- —OC(CH₃)₃ 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(morpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic p-[(morpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-F₃CO-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—SO₂—C(CH₃)₂- (L-1,1-dioxo-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—SO₂—C(CH₃)₂- (L-1,1-dioxo-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(morpholin-4-yl)C(O)O-]benzyl- —OH —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—SO₂—C(CH₃)₂- (L-1,1-dioxo-5,5- dimethylthiazolidin-4- yl) pyrimidin-2-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(methylpiperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ yl- 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—SO₂—CH₂- (L-1,1- dioxothiazolidin-4-yl) p-CH₃-φ- R²/R³ = cyclic p-[(piperidin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(1,1-dioxothiomorpholin-4-yl)- —OC(CH₃)₃ 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(pyrrolidin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—CH₂- (L-thiazolidin-4-yl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—SO₂—CH₂- (L-1,1- dioxothiazolidin-4-yl) 2,5-dichlorothien-3- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ yl- 3 carbon atoms (L-pyrrolidinyl) p-CH₃C(O)NH-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-C(CH₃)₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) pyridin-2-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) o-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) m-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 2,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃C(O)NH-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-C(F)₃O-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-N≡C-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) morpholin-4-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—C(CH₃)₂- (L-4,4-dimethyl pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—CH₂—C(CH₃)₂- (L-4,4-dimethyl pyrrolidinyl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ yl 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) 1-methylimidazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH yl- 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- -° C.(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃C(O)NH-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-(CH₃)₃C-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) pyridin-3-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-N≡C-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- p-CH₃-φ- R²/R³ = cyclic p-[(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)-C(O)O- —OCH₂CH₃ 3 carbon atoms ]benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)-C(O)O- —OH 3 carbon atoms ]benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-acetylpiperazin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-methanesulfonylpiperazin-1-yl)- —OH 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-φ-piperazin-1-yl)C(O)(O)-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(piperazin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) R¹/R² = —CH₃ p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OH saccharin-2-yl- p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—NH—CH₂- (L-piperizinyl) p-F₃CO-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—C(CH₃)₂- (4,4-dimethyl pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—CH₂—C(CH₃)₂- (4,4-dimethyl pyrrolidinyl) p-CH₃C(O)NH-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) o-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) morpholin-4-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) m-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 2,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) morpholin-4-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ yl- —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) o-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 2,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—CH₂—S—CH₂- (L-thiomorpholin-3- yl) pyridin-3-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) m-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) pyridin-2-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH yl- —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ- R²/R³ = cyclic p-[(4-methanesulfonylpiperazin-1-yl)- —OC(CH₃)₃ 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-φ-piperazin-1-yl)C(O)(O)-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —O—CH₂C(CH₃)₂— 3 carbon atoms NHC(O)OC(CH₃)₃ (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —O—CH₂CH₂- 3 carbon atoms (morpholin-4 yl) (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-acetylpiperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NCH₂CH₂N(CH₃)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NCH₂CH₂N(CH₃)C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NCH₂CH₂N(CH₃)C(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NCH₂CH₂N(CH₃)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-hydroxypiperidin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-(CH₃)₃C-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 2,5-dichlorothien-3- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH yl- 3 carbon atoms (L-pyrrolidinyl) p-CH₃O-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—CH₂—C(CH₃)₂- (4,4-dimethyl pyrrolidinyl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(4-methylpiperizin-1-yl)C(O)O-]- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O-]-benzyl- —OH —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(thiomorpholin-4-yl)C(O)O-]-benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(morpholin-4-yl)-CH₂CH₂NHC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)-C(O)O- —OC(CH₃)₃ 3 carbon atoms ]benzyl- (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O-]-benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) pyridin-2-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—CH₂—S(O)—CH₂- (L-1- oxothiomorpholin-4- yl) 4-Cl-3-(NH₂—SO₂-)- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ φ- 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(thiomorpholin-4-yl)C(O)O-]-benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O-]-benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[HOCH₂CH₂N(CH₃)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(2-(hydroxymethyl)pyrrolidin-1-yl)-C(O)O-]- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic p-[(2-(hydroxymethyl)pyrrolidin-1-yl)-C(O)O-]- —OH —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p[(2-(CH₃OC(O)-)pyrrolidin-1-yl)-C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p[(4-(HC(O)O-)piperidin-1-yl)-C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p[(4-hydroxypiperidin-1-yl)-C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(thiomorpholin-4-yl)-C(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(CH₃CH₂OC(O)-)piperidin-1-yl)C(O)O-]- —OC(CH₃)₃ 3 carbon atoms benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(HOCH₂CH₂-)piperazin-1-yl)-C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(4-pyridin-2-yl)piperazin-1-yl)-C(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic p-[(4-pyridin-2-yl)piperazin-1-yl)-C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[HC(O)OCH₂CH₂N(CH₃)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[HOCH₂CH₂N(CH₃)C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[CH₃OC(O)CH₂NHC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) quinolin-8-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) 3,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[thiomorpholin-4-yl)-C(O)O-]-benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃O-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—CH₂—S(O)—CH₂- (L-1- oxothiomorpholin-4- yl) 3,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) p-H₂N-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) 3,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 3,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) quinolin-8-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—S(O)—CH₂- (L-1- oxothiomorpholin-4- yl) 1-n-butylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-3- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 2-(CF₃C(O)-)- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ 1,2,3,4-tetrahydro- 3 carbon atoms isoquinolin-7-yl (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(φNHC(O)-)-piperazin-1-yl)-C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-methoxypiperidin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[4-(pyridin-4-ylC(O))piperazin-1-yl)- —OCH(CH₃)₂ 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—C(O)—CH₂- (L-4-oxopyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH(OH)CH₂- (L-4- hydroxypyrrolidinyl) m-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-methoxypiperidin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(φNHC(O)-)piperazin-1-yl)-C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-(φNHC(O)NH)φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(4-methylpiperidin-1-yl)-C(O)O-]- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O-]-benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(CF₃SO₂-)piperazin-1-yl)-C(O)O]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(morpholin-4-yl)CH₂CH₂NHC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(HO(O)C-)piperidin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(HOCH₂CH₂)₂NC(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-O₂N-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(HOCH₂-)piperidin-1-yl)-C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O)-]-benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—CH₂—S—CH₂- (L-thiomorpholin-3- yl) 1-methylpyrazol-3- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) m-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) o-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 3,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 3,5-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 2,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-NH₂-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-N≡C-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH(OH)CH₂- (L-4- hydroxypyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂C(O)CH₂- (L-4-oxopyrrolidinyl) pyridin-2-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-Cl-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) m-Cl-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) o-Cl-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 3,4-dichloro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 3,5-dichloro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂CH₃ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) pyridin-3-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(thiomorpholin-4-yl)-C(O)O-]benzyl- —OCH(CH₃)₂ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) quinolin-8-yl R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) m-Cl-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) pyridin-2-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 3,4-dichloro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 2,5-dichlorothien-3- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃O-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) m-CH₃O-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) o-CH₃O-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 3,4-dimethoxy-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 2,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—S—CH₂- (L-thiomorpholin-3- yl) 3,4-dichloro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) m-Cl-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 2,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—S(O)—CH₂- (L-1- oxothiomorpholin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—C(O)—CH₂- (L-4-oxopyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)-C(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH(OH)CH₂- (L-4- hydroxypyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(3-(HOCH₂-)piperidin-1-yl)-C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—CF₂—CH₂- (L-4,4-difluoro- pyrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —O(CH₂CH₂O)₂CH₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)-C(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH(—O- C(O)thiomorpholin-4- yl)-CH₂- (L-4-(thiomorpholin- 4-ylC(O)O- pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—CF₂—CH₂- (L-4,4-difluoro- pyrolidinyl) p-F-φ- R²/R³ = cyclic p-[(4-(pyrimidin-2-yl)piperazin-1-yl)- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- C(O)O-]benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(φC(O)-)piperazin-1-yl)-C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic 3-fluoro-4-[(CH₃)₂NC(O)O-]-benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₂ —CH₂CH₂N- (-SO₂CH₃)—CH₂- (L-4- methanesulfonyl- piperizinyl) R¹/R² = H p-[(CH₃)₂NC(O)O-]benzyl- —OH 1,1-dioxo-2,3- dihydro-3,3- dimethyl-1,2- benzisothiazol-2-yl- 1-methylimidazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ yl- 3 carbon atoms (L-pyrrolidinyl) R¹/R² = H p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ N-2,10- camphorsultamyl- R¹/R² = H p-[(CH₃)₂NC(O)O-]benzyl- —OH N-2,10- camphorsultamyl- R¹/R² = H 3-chloro-4-[(CH₃)₂NC(O)O)-]-benzyl- —OCH(CH₃)₂ N-2,10- camphorsultamyl- p-Br-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-Br-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-NH₂C(═N)-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₃ 3 carbon atoms (L-pyrrolidinyl) p-N≡C-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)-C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)-C(O)O-]benzyl- —OH —CH₂CH(—O- C(O)thiomorpholin-4- yl)-CH₂- (L-4-(thiomorpholin- 4-ylC(O)O- pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl-)C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—C(O)—CH₂- (L-4-oxopyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)-C(O)O-]benzyl- —OH —CH₂—C(O)—CH₂- (L-4-oxopyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)-C(O)O-]benzyl- —OH —CH₂—C(O)—CH₂- (L-4-oxopyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(4-(pyrimidin-2-yl)piperazin-1-yl)-C(O)O-] —OH —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) quinolin-8-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) pyridin-4-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic p-[4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) m-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—CH₂—S- (thiazolidin-2-yl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—S- (thiazolidin-2-yl) p-CH₃-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OH —CH₂—C(O)—CH₂- (L-4-oxopyrrolidinyl) p-NH₂—C(═N)-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OCH₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-methylpiperazin-1-yl)-C(O)O-]benzyl- —OH —CH₂—C(O)—CH₂- (L-4-oxopyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)- —OH —CH₂—CH₂—S- C(O)O-]benzyl- (thiazolidin-2-yl) p-NO₂-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)- —OC(CH₃)₃ 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)- —OC(CH₃)₃ —CH₂—CH₂—S- C(O)O-]benzyl- (thiazolidin-2-yl) p-Br-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)- —OH —CH₂—S—C(CH₃)₂- C(O)O-]benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(φC(O)-)piperazin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(φNHC(S)-)piperazin-1-yl)-C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(4-CH₃-homopiperazin-1-yl)-C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—S- (thiazolidin-2-yl) p-CH₃-φ- R²/R³ = cyclic p-[p-CH₃-φ-SO₂N(CH₃)CH₂CH₂N(CH₃)— —OCH(CH₃)₂ 3 carbon atoms C(O)O-]benzyl- (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[φNHC(O)O-CH₂CH₂NHC(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) 3-Cl-4-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH₂—SO₂—CH₂- (L-1,1- dioxothiomorpholin- 3-yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ yl- —CH₂—CH₂—S—CH₂- (L-thiomorpholin-3- yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH(—OSO₂CH₃)— CH₂- (L-4-methanesulfoxy- pyrrolidinyl) p-H₂NC(O)-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-H₂N—C(═N)-φ R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-H₂NC(O)-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-)benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-H₂NC(═N)-φ- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-)benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-NO₂-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)-C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]- —OCH₂CH₃ —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]- —OH —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic p-[(4-CH₃-homopiperizin-1-yl)C(O)O-]benzyl- —OH —CH₂—CH₂—S- (thiazolidin-2-yl) 1-methylpyrazol-4- R²/R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ yl- —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) 1-methylimidazol-4- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ yl- 3 carbon atoms (L-pyrrolidinyl) 1-methylimidazol-4- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ yl- 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH₂N(—SO₂— CH₃)CH₂- (4-methanesulfonyl- piperizin-2-yl) p-CH₃-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂CH(—OSO₂— CH₃)CH₂- (L-4-methanesulfoxy- pyrrolidinyl) 3,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—CH₂—S—CH₂- (L-thiomorpholin-3- yl) pyridin-3-yl- R²/R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OCH(CH₃)₂ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) CH₃— —CH₂φ H p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 3,4-difluoro-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—CH₂—S—CH₂- (L-thiomorpholin-3- yl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ —CH₂CH(OH)CH₂- (L-4- hydroxypyrrolidinyl) p-Br-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CF₃O-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CF₃O-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-CF₃O-φ R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic p-[(4-pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) p-F-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH —CH₂CH(OH)CH₂- (L-4- hydroxypyrrolidinyl) p-CF₃O-φ- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylimidazol-4- R²/R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O)-]benzyl- —OH yl- 3 carbon atoms (L-pyrrolidinyl) 1-methylimidazol-4- R²/R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O)-]benzyl- —OCH(CH₃)₂ yl- 3 carbon atoms (L-pyrrolidinyl) 1-methylimidazol-4- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH yl- 3 carbon atoms (L-pyrrolidinyl) 1-methylimidazol-4- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methypyrazol-4- R²/R³ = cyclic p[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH yl- 3 carbon atoms (L-pyrrolidinyl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ yl- 3 carbon atoms (L-pyrrolidinyl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ yl- 3 carbon atoms (L-pyrrolidinyl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylimidazol-4- R²/R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin-1- —OCH(CH₃)₂ yl- 3 carbon atoms yl)C(O)O]benzyl- (L-pyrrolidinyl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂CH₂Oφ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]- —OH yl- —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]- —OCH₂CH₃ yl- —CH₂—S—C(CH₃)₂- benzyl- (L-5,5- dimethylthiazolidin-4- yl) 1,5-dimethyl-3- R²/R³ = cyclic p-[4-[5-CF₃-pyridin-2-yl)piperazin-1 yl)- —OH chloropyrazol-4-yl- —CH₂—S—C(CH₃)₂- C(O)O-]benzyl- (L-5,5- dimethylthiazolidin-4- yl) p-F-φ- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂CH(OH)CH₂- (L-4- hydroxypyrrolidinyl) pyridin-4-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂C(CH₃)₃ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂O— yl- —CH₂—S—C(CH₃)₂- C(O)C(CH₃)₃ (L-5,5- dimethylthiazolidin-4- yl) pyridin-3-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂C(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- 2-CH₃O-φ-O- yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- -OCH₂cyclopropyl yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂CH₂CH₃ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂CH₂CH₂CH₃ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) 1-methylpyrazol-4- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —O—CH₃ yl- —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) pyridin-3-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) pyridin-3-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂CH₃ —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl) pyridin-3-yl- R²/R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- -OCH₂cyclopropyl —CH₂—S—C(CH₃)₂- (L-5,5- dimethylthiazolidin-4- yl)

TABLE IB

R¹ R² R³ A R⁶ p-CH₁-φ- R²/R³ = cyclic —OC(O)-(pyrizin-1,4-diyl)-C(O))— —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) p-CH₁-φ- R²/R³ = cyclic —OC(O)-(pyrizin-1,4-diyl)-C(O))— —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) p-CH₁-φ- R²/R³ = cyclic —OC(O)-(pyrizin-1,4-diyl)-C(O))— —OH 3 carbon atoms (L-pyrrolidinyl) p-CH₁-φ- R²/R³ = cyclic —OC(O)-(pyrizin-1,4-diyl)-C(O))— —OC(CH₃)₃ —CH₂—S—C(CH₃)₂— (L-5,5- dimethylthiazolidin-4-yl) p-CH₁-φ- R²/R³ = cyclic —OC(O)-(pyrizin-1,4-diyl)-C(O))— —OH —CH₂—S—C(CH₃)₂— (L-5,5- dimethylthiazolidin-4-yl)

DETAILED DESCRIPTION OF THE INVENTION

This invention relates to compounds which inhibit leukocyte adhesion and, in particular, leukocyte adhesion mediated by VLA-4. When describing the compounds, compositions and methods of this invention, the following terms have the following meanings, unless otherwise indicated.

Definitions

As used herein, “alkyl” refers to alkyl groups preferably having from 1 to 10 carbon atoms and more preferably 1 to 6 carbon atoms. This term is exemplified by groups such as methyl, t-butyl, n-heptyl, octyl and the like.

“Substituted alkyl” refers to an alkyl group, preferably of from 1 to 10 carbon atoms, having from 1 to 5 substituents selected from the group consisting of alkoxy, substituted alkoxy, acyl, acylamino, thiocarbonylamino, acyloxy, amino, amidino, alkyl amidino, thioamidino, aminoacyl, aminocarbonylamino, aminothiocarbonylamino, aminocarbonyloxy, aryl, substituted aryl, aryloxy, substituted aryloxy, aryloxylaryl, substituted aryloxyaryl, cyano, halogen, hydroxyl, nitro, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheteroaryl, substituted thioheteroaryl, thioheterocyclic, substituted thioheterocyclic, heteroaryl, substituted aryl, substituted heteroaryl, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —OS(O)₂-alkyl, —OS(O)₂-substituted alkyl, —OS(O)₂-aryl, —OS(O)₂-substituted aryl, —OS(O)₂-heteroaryl, —OS(O)₂-substituted heteroaryl, —OS(O)₂-heterocyclic, —OS(O)₂-substituted heterocyclic, —OSO₂—NRR where R is hydrogen or alkyl, —NRS(O)₂-alkyl, —NRS(O)₂-substituted alkyl, —NRS(O)₂-aryl, —NRS(O)₂-substituted aryl, —NRS(O)₂-heteroaryl, —NRS(O)₂-substituted heteroaryl, —NRS(O)₂-heterocyclic, —NRS(O)₂-substituted heterocyclic, —NRS(O)₂—NR-alkyl, —NRS(O)₂—NR-substituted alkyl, —NRS(O)₂—NR-aryl, —NRS(O)₂—NR-substituted aryl, —NRS(O)—NR-heteroaryl, —NRS(O)₂—NR-substituted heteroaryl, —NRS(O)₂—NR-heterocyclic, —NRS(O)₂—NR-substituted heterocyclic where R is hydrogen or alkyl, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-substituted arylamino, mono- and di-heteroarylamino, mono- and di-substituted heteroarylamino, mono- and di-heterocyclic amino, mono- and di-substituted heterocyclic amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic and substituted alkyl groups having amino groups blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like or alkyl/substituted alkyl groups substituted with —SO₂-alkyl, —SO₂-substituted alkyl, —SO₂-alkenyl, —SO₂-substituted alkenyl, —SO₂-cycloalkyl, —SO₂-substituted cycloalkyl, —SO₂-aryl, —SO₂-substituted aryl, —SO₂-heteroaryl, —SO₂-substituted heteroaryl, —SO₂-heterocyclic, —SO₂-substituted heterocyclic and —SO₂NRR where R is hydrogen or alkyl.

“Alkoxy” refers to the group “alkyl-O—” which includes, by way of example, methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, tert-butoxy, sec-butoxy, n-pentoxy, n-hexoxy, 1,2-dimethylbutoxy, and the like.

“Substituted alkoxy” refers to the group “substituted alkyl-O—”.

“Acyl” refers to the groups H—C(O)—, alkyl-C(O)—, substituted alkyl-C(O)—, alkenyl-C(O)—, substituted alkenyl-C(O)—, alkynyl-C(O)—, substituted alkynyl-C(O)— cycloalkyl-C(O)—, substituted cycloalkyl-C(O)—, aryl-C(O)—, substituted aryl-C(O)—, heteroaryl-C(O)—, substituted heteroaryl-C(O), heterocyclic-C(O)—, and substituted heterocyclic-C(O)— wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Acylamino” refers to the group —C(O)NRR where each R is independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic and where each R is joined to form together with the nitrogen atom a heterocyclic or substituted heterocyclic ring wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Thiocarbonylamino” refers to the group —C(S)NRR where each R is independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic and where each R is joined to form, together with the nitrogen atom a heterocyclic or substituted heterocyclic ring wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Acyloxy” refers to the groups alkyl-C(O)O—, substituted alkyl-C(O)O—, alkenyl-C(O)O—, substituted alkenyl-C(O)O—, alkynyl-C(O)O—, substituted alkynyl-C(O)O—, aryl-C(O)O—, substituted aryl-C(O)O—, cycloalkyl-C(O)O—, substituted cycloalkyl-C(O)O—, heteroaryl-C(O)O—, substituted heteroaryl-C(O)O—, heterocyclic-C(O)O—, and substituted heterocyclic-C(O)O— wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Alkenyl” refers to alkenyl group preferably having from 2 to 10 carbon atoms and more preferably 2 to 6 carbon atoms and having at least 1 and preferably from 1-2 sites of alkenyl unsaturation.

“Substituted alkenyl” refers to alkenyl groups having from 1 to 5 substituents selected from the group consisting of alkoxy, substituted alkoxy, acyl, acylamino, thiocarbonylamino, acyloxy, amino, amidino, alkylamidino, thioamidino, aminoacyl, aminocarbonylamino, aminothiocarbonylamino, aminocarbonyloxy, aryl, substituted aryl, aryloxy, substituted aryloxy, aryloxyaryl, substituted aryloxyaryl, halogen, hydroxyl, cyano, nitro, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheteroaryl, substituted thioheteroaryl, thioheterocyclic, substituted thioheterocyclic, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —OS(O)₂-alkyl, —OS(O)₂-substituted alkyl, —OS(O)₂-aryl, —OS(O)₂-substituted aryl, —OS(O)₂-heteroaryl, —OS(O)₂-substituted heteroaryl, —OS(O)₂-heterocyclic, —OS(O)₂-substituted heterocyclic, —OSO₂—NRR where R is hydrogen or alkyl, —NRS(O)₂-alkyl, —NRS(O)₂-substituted alkyl, —NRS(O)₂-aryl, —NRS(O)₂-substituted aryl, —NRS(O)₂-heteroaryl, —NRS(O)₂-substituted heteroaryl, —NRS(O)₂-heterocyclic, —NRS(O)₂-substituted heterocyclic, —NRS(O)₂—NR-alkyl, —NRS(O)₂—NR-substituted alkyl, —NRS(O)₂—NR-aryl, —NRS(O)₂—NR-substituted aryl, —NRS(O)₂—NR-heteroaryl, —NRS(O)₂—NR-substituted heteroaryl, —NRS(O)₂—NR-heterocyclic, —NRS(O)₂—NR-substituted heterocyclic where R is hydrogen or alkyl, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-substituted arylamino, mono- and di-heteroarylamino, mono- and di-substituted heteroarylamino, mono- and di-heterocyclic amino, mono- and di-substituted heterocyclic amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic and substituted alkenyl groups having amino groups blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like or alkenyl/substituted alkenyl groups substituted with —SO₂-alkyl, —SO₂-substituted alkyl, —SO₂-alkenyl, —SO₂-substituted alkenyl, —SO₂-cycloalkyl, —SO₂-substituted cycloalkyl, —SO₂-aryl, —SO₂-substituted aryl, —SO₂-heteroaryl, —SO₂-substituted heteroaryl, —SO₂-heterocyclic, —SO₂-substituted heterocyclic and —SO₂NRR where R is hydrogen or alkyl.

“Alkynyl” refers to alkynyl group preferably having from 2 to 10 carbon atoms and more preferably 3 to 6 carbon atoms and having at least 1 and preferably from 1-2 sites of alkynyl unsaturation.

“Substituted alkynyl” refers to alkynyl groups having from 1 to 5 substituents selected from the group consisting of alkoxy, substituted alkoxy, acyl, acylamino, thiocarbonylamino, acyloxy, amino, amidino, alkylamidino, thioamidino, aminoacyl, aminocarbonylamino, aminothiocarbonylamino, aminocarbonyloxy, aryl, substituted aryl, aryloxy, substituted aryloxy, aryloxyaryl, substituted aryloxyaryl, halogen, hydroxyl, cyano, nitro, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheteroaryl, substituted thioheteroaryl, thioheterocyclic, substituted thioheterocyclic, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —OS(O)₂-alkyl, —OS(O)₂-substituted alkyl, —OS(O)₂-aryl, —OS(O)₂-substituted aryl, —OS(O)₂-heteroaryl, —OS(O)₂-substituted heteroaryl, —OS(O)₂-heterocyclic, —OS(O)₂-substituted heterocyclic, —OSO₂—NRR where R is hydrogen or alkyl, —NRS(O)₂-alkyl, —NRS(O)₂-substituted alkyl, —NRS(O)₂-aryl, —NRS(O)₂-substituted aryl, —NRS(O)₂-heteroaryl, —NRS(O)₂-substituted heteroaryl, —NRS(O)₂-heterocyclic, —NRS(O)₂-substituted heterocyclic, —NRS(O)₂—NR-alkyl, —NRS(O)₂—NR-substituted alkyl, —NRS(O)₂—NR-aryl, —NRS(O)₂—NR-substituted aryl, —NRS(O)₂—NR-heteroaryl, —NRS(O)₂—NR-substituted heteroaryl, —NRS(O)₂—NR-heterocyclic, —NRS(O)₂—NR-substituted heterocyclic where R is hydrogen or alkyl, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-substituted arylamino, mono- and di-heteroarylamino, mono- and di-substituted heteroarylamino, mono- and di-heterocyclic amino, mono- and di-substituted heterocyclic amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic and substituted alkynyl groups having amino groups blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like or alkynyl/substituted alkynyl groups substituted with —SO₂-alkyl, —SO₂-substituted alkyl, —SO₂-alkenyl, —SO₂-substituted alkenyl, —SO₂-cycloalkyl, —SO₂-substituted cycloalkyl, —SO₂-aryl, —SO₂-substituted aryl, —SO₂-heteroaryl, —SO₂-substituted heteroaryl, —SO₂-heterocyclic, —SO₂-substituted heterocyclic and —SO₂NRR where R is hydrogen or alkyl.

“Alkylene” refers to a divalent alkylene group preferably having from 1 to 10 carbon atoms and more preferably 1 to 6 carbon atoms. This term is exemplified by groups such as methylene (—CH₂—), ethylene (—CH₂CH₂—), the propylene isomers (e.g., —CH₂CH₂CH₂— and —CH(CH₃)CH₂—) and the like.

“Substituted alkylene” refers to alkylene groups having from 1 to 5 substituents selected from the group consisting of alkoxy, substituted alkoxy, acyl, acylamino, thiocarbonylamino, acyloxy, amino, amidino, alkylamidino, thioamidino, aminoacyl, aminocarbonylamino, aminothiocarbonylamino, aminocarbonyloxy, aryl, substituted aryl, aryloxy, substituted aryloxy, aryloxyaryl, substituted aryloxyaryl, halogen, hydroxyl, cyano, nitro, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheteroaryl, substituted thioheteroaryl, thioheterocyclic, substituted thioheterocyclic, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —OS(O)₂-alkyl, —OS(O)₂-substituted alkyl, —OS(O)₂-aryl, —OS(O)₂-substituted aryl, —OS(O)₂-heteroaryl, —OS(O)₂-substituted heteroaryl, —OS(O)₂-heterocyclic, —OS(O)₂-substituted heterocyclic, —OSO₂—NRR where R is hydrogen or alkyl, —NRS(O)₂-alkyl, —NRS(O)₂-substituted alkyl, —NRS(O)₂-aryl, —NRS(O)₂-substituted aryl, —NRS(O)₂-heteroaryl, —NRS(O)₂-substituted heteroaryl, —NRS(O)₂-heterocyclic, —NRS(O)₂-substituted heterocyclic, —NRS(O)₂—NR-alkyl, —NRS(O)₂—NR-substituted alkyl, —NRS(O)₂—NR-aryl, —NRS(O)₂—NR-substituted aryl, —NRS(O)₂—NR-heteroaryl, —NRS(O)₂—NR-substituted heteroaryl, —NRS(O)₂—NR-heterocyclic, —NRS(O)₂—NR-substituted heterocyclic where R is hydrogen or alkyl, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-substituted arylamino, mono- and di-heteroarylamino, mono- and di-substituted heteroarylamino, mono- and di-heterocyclic amino, mono- and di-substituted heterocyclic amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic and substituted alkenyl groups having amino groups blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like or alkenyl/substituted alkenyl groups substituted with —SO₂-alkyl, —SO₂-substituted alkyl, —SO₂-alkenyl, —SO₂-substituted alkenyl, —SO₂-cycloalkyl, —SO₂-substituted cycloalkyl, —SO₂-aryl, —SO₂-substituted aryl, —SO₂-heteroaryl, —SO₂-substituted heteroaryl, —SO₂-heterocyclic, —SO₂-substituted heterocyclic and —SO₂NRR where R is hydrogen or alkyl.

“Amidino” refers to the group H₂NC(═NH)— and the term “alkylamidino” refers to compounds having 1 to 3 alkyl groups (e.g., alkylHNC(═NH)—).

“Thioamidino” refers to the group RSC(═NH)— where R is hydrogen or alkyl.

“Aminoacyl” refers to the groups —NRC(O)alkyl, —NRC(O)substituted alkyl, —NRC(O)cycloalkyl, —NRC(O)substituted cycloalkyl, —NRC(O)alkenyl, —NRC(O)substituted alkenyl, —NRC(O)alkynyl, —NRC(O)substituted alkynyl, —NRC(O)aryl, —NRC(O)substituted aryl, —NRC(O)heteroaryl, —NRC(O)substituted heteroaryl, —NRC(O)heterocyclic, and —NRC(O)substituted heterocyclic where R is hydrogen or alkyl and wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Aminocarbonyloxy” refers to the groups —NRC(O)O-alkyl, —NRC(O)O-substituted alkyl, —NRC(O)O-alkenyl, —NRC(O)O-substituted alkenyl, —NRC(O)O-alkynyl, —NRC(O)O-substituted alkynyl, —NRC(O)O-cycloalkyl, —NRC(O)O-substituted cycloalkyl, —NRC(O)O-aryl, —NRC(O)O-substituted aryl, —NRC(O)O-heteroaryl, —NRC(O)O-substituted heteroaryl, —NRC(O)O-heterocyclic, and —NRC(O)O-substituted heterocyclic where R is hydrogen or alkyl and wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Oxycarbonylairino” refers to the groups —OC(O)NH₂, —OC(O)NRR, —OC(O)NR-alkyl, —OC(O)NR-substituted alkyl, —OC(O)NR-alkenyl, —OC(O)NR-substituted alkenyl, —OC(O)NR-alkynyl, —OC(O)NR-substituted alkynyl, —OC(O)NR-cycloalkyl, —OC(O)NR-substituted cycloalkyl, —OC(O)NR-aryl, —OC(O)NR-substituted aryl, —OC(O)NR-heteroaryl, —OC(O)NR-substituted heteroaryl, —OC(O)NR-heterocyclic, and —OC(O)NR-substituted heterocyclic where R is hydrogen, alkyl or where each R is joined to form, together with the nitrogen atom a heterocyclic or substituted heterocyclic ring and wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Oxythiocarbonylamino” refers to the groups —OC(S)NH₂, —OC(S)NRR, —OC(S)NR-alkyl, —OC(S)NR-substituted alkyl, —OC(S)NR-alkenyl, —OC(S)NR-substituted alkenyl, —OC(S)NR-alkynyl, —OC(S)NR-substituted alkynyl, —OC(S)NR-cycloalkyl, —OC(S)NR-substituted cycloalkyl, —OC(S)NR-aryl, —OC(S)NR-substituted aryl, —OC(S)NR-heteroaryl, —OC(S)NR-substituted heteroaryl, —OC(S)NR-heterocyclic, and —OC(S)NR-substituted heterocyclic where R is hydrogen, alkyl or where each R is joined to form together with the nitrogen atom a heterocyclic or substituted heterocyclic ring and wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Aminocarbonylamino” refers to the groups —NRC(O)NRR, —NRC(O)NR-alkyl, —NRC(O)NR-substituted alkyl, —NRC(O)NR-alkenyl, —NRC(O)NR-substituted alkenyl, —NRC(O)NR-alkynyl, —NRC(O)NR-substituted alkynyl, —NRC(O)NR-aryl, —NRC(O)NR-substituted aryl, —NRC(O)NR-cycloalkyl, —NRC(O)NR-substituted cycloalkyl, —NRC(O)NR-heteroaryl, and —NRC(O)NR-substituted heteroaryl, —NRC(O)NR-heterocyclic, and —NRC(O)NR-substituted heterocyclic where each R is independently hydrogen, alkyl or where each R is joined to form together with the nitrogen atom a heterocyclic or substituted heterocyclic ring as well as where one of the amino groups is blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like and wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Aminothiocarbonylamino” refers to the groups —NRC(S)NRR, —NRC(S)NR-alkyl, —NRC(S)NR-substituted alkyl, —NRC(S)NR-alkenyl, —NRC(S)NR-substituted alkenyl, —NRC(S)NR-alkynyl, —NRC(S)NR-substituted alkynyl, —NRC(S)NR-aryl, —NRC(S)NR-substituted aryl, —NRC(S)NR-cycloalkyl, —NRC(S)NR-substituted cycloalkyl, —NRC(S)NR-heteroaryl, and —NRC(S)NR-substituted heteroaryl, —NRC(S)NR-heterocyclic, and —NRC(S)NR-substituted heterocyclic where each R is independently hydrogen, alkyl or where each R is joined to form together with the nitrogen atom a heterocyclic or substituted heterocyclic ring as well as where one of the amino groups is blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like and wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Aryl” or “Ar” refers to an unsaturated aromatic carbocyclic group of from 6 to 14 carbon atoms having a single ring (e.g., phenyl) or multiple condensed rings (e.g., naphthyl or anthryl) which condensed rings may or may not be aromatic (e.g., 2-benzoxazolinone, 2H-1,4-benzoxazin-3(4H)-one-7yl, and the like). Preferred aryls include phenyl and naphthyl.

Substituted aryl refers to aryl groups which are substituted with from 1 to 3 substituents selected from the group consisting of hydroxy, acyl, acylamino, thiocarbonylamino, acyloxy, alkyl, substituted alkyl, alkoxy, substituted alkoxy, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, amidino, alkylamidino, thioamidino, amino, aminoacyl, aminocarbonyloxy, aminocarbonylamino, aminothiocarbonylamino, aryl, substituted aryl, aryloxy, substituted aryloxy, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, carboxylamido, cyano, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thioheteroaryl, substituted thioheteroaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheterocyclic, substituted thioheterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, halo, nitro, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —S(O)₂-alkyl, —S(O)₂-substituted alkyl, —S(O)₂-cycloalkyl, —S(O)₂-substituted cycloalkyl, —S(O)₂-alkenyl, —S(O)₂-substituted alkenyl, —S(O)₂-aryl, —S(O)₂-substituted aryl, —S(O)₂-heteroaryl, —S(O)₂-substituted heteroaryl, —S(O)₂-heterocyclic, —S(O)₂-substituted heterocyclic, —OS(O)₂-alkyl, —OS(O)₂-substituted alkyl, —OS(O)₂-aryl, —OS(O)₂-substituted aryl, —OS(O)₂-heteroaryl, —OS(O)₂-substituted heteroaryl, —OS(O)₂-heterocyclic, —OS(O)₂-substituted heterocyclic, —OS(O)₂-NRR where R is hydrogen or alkyl, —NRS(O)₂-alkyl, —NRS(O)₂-substituted alkyl, —NRS(O)₂-aryl, —NRS(O)₂-substituted aryl, —NRS(O)₂-heteroaryl, —NRS(O)₂-substituted heteroaryl, —NRS(O)₂-heterocyclic, —NRS(O)₂-substituted heterocyclic, —NRS(O)₂—NR-alkyl, —NRS(O)₂—NR-substituted alkyl, —NRS(O)₂—NR-aryl, —NRS(O)₂—NR-substituted aryl, —NRS(O)₂—NR-heteroaryl, —NRS(O)₂—NR-substituted heteroaryl, —NRS(O)₂—NR-heterocyclic, —NRS(O)₂—NR-substituted heterocyclic where R is hydrogen or alkyl, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-substituted arylamino, mono- and di-heteroarylamino, mono- and di-substituted heteroarylamino, mono- and di-heterocyclic amino, mono- and di-substituted heterocyclic amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic and amino groups on the substituted aryl blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like or substituted with —SO₂NRR where R is hydrogen or alkyl.

“Aryloxy” refers to the group aryl-O— which includes, by way of example, phenoxy, naphthoxy, and the like.

“Substituted aryloxy” refers to substituted aryl-O— groups.

“Aryloxyaryl” refers to the group -aryl-O-aryl.

“Substituted aryloxyaryl” refers to aryloxyaryl groups substituted with from 1 to 3 substituents on either or both aryl rings selected from the group consisting of hydroxy, acyl, acylamino, thiocarbonylamino, acyloxy, alkyl, substituted alkyl, alkoxy, substituted alkoxy, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, amidino, alkylamidino, thioamidino, amino, aminoacyl, aminocarbonyloxy, aminocarbonylamino, aminothiocarbonylamino, aryl, substituted aryl, aryloxy, substituted aryloxy, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, carboxylamido, cyano, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thioheteroaryl, substituted thioheteroaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheterocyclic, substituted thioheterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, halo, nitro, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —S(O)₂-alkyl, —S(O)₂-substituted alkyl, —S(O)₂-cycloalkyl, —S(O)₂-substituted cycloalkyl, —S(O)₂-alkenyl, —S(O)₂-substituted alkenyl, —S(O)₂-aryl, —S(O)₂-substituted aryl, —S(O)₂-heteroaryl, —S(O)₂-substituted heteroaryl, —S(O)₂-heterocyclic, —S(O)₂-substituted heterocyclic, —OS(O)₂-alkyl, —OS(O)₂-substituted alkyl, —OS(O)₂-aryl, —OS(O)₂-substituted aryl, —OS(O)₂-heteroaryl, —OS(O)₂-substituted heteroaryl, —OS(O)₂-heterocyclic, —OS(O)₂-substituted heterocyclic, —OS(O)₂—NRR where R is hydrogen or alkyl, —NRS(O)₂-alkyl, —NRS(O)₇-substituted alkyl, —NRS(O)₂-aryl, —NRS(O)₂-substituted aryl, —NRS(O)₂-heteroaryl, —NRS(O)₂-substituted heteroaryl, —NRS(Q)₂-heterocyclic, —NRS(O)₂-substituted heterocyclic, —NRS(O)₂—NR-alkyl, —NRS(O)₂—NR-substituted alkyl, —NRS(O)₂—NR-aryl, —NRS(O)₂—NR-substituted aryl, —NRS(O)₂—NR-heteroaryl, —NRS(O)₂—NR-substituted heteroaryl, —NRS(O)₂—NR-heterocyclic, —NRS(O)₂—NR-substituted heterocyclic where R is hydrogen or alkyl, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-substituted arylamino, mono- and di-heteroarylamino, mono- and di-substituted heteroarylamino, mono- and di-heterocyclic amino, mono- and di-substituted heterocyclic amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic and amino groups on the substituted aryl blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like or substituted with —SO₂NRR where R is hydrogen or alkyl.

“Cycloalkyl” refers to cyclic alkyl groups of from 3 to 8 carbon atoms having a single cyclic ring including, by way of example, cyclopropyl, cyclobutyl, cyclopentyl, cyclooctyl and the like. Excluded from this definition are multi-ring alkyl groups such as adamantanyl, etc.

“Cycloalkenyl” refers to cyclic alkenyl groups of frm 3 to 8 carbon atoms having a single cyclic ring.

“Substituted cycloalkyl” and “substituted cycloalkenyl” refers to an cycloalkyl or cycloalkenyl group, preferably of from 3 to 8 carbon atoms, having from 1 to 5 substituents selected from the group consisting of oxo (═O), thioxo (═S), alkoxy, substituted alkoxy, acyl, acylamino, thiocarbonylamino, acyloxy, amino, amidino, alkylamidino, thioamidino, aminoacyl, aminocarbonylamino, aminothiocarbonylamino, aminocarbonyloxy, aryl, substituted aryl, aryloxy, substituted aryloxy, aryloxyaryl, substituted aryloxyaryl, halogen, hydroxyl, cyano, nitro, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheteroaryl, substituted thioheteroaryl, thioheterocyclic, substituted thioheterocyclic, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —OS(O)₂-alkyl, —OS(O)₂-substituted alkyl, —OS(O)₂-aryl, —OS(O)₂-substituted aryl, —OS(O)₂-heteroaryl, —OS(O)₂-substituted heteroaryl, —OS(O)₂-heterocyclic, —OS(O)₂-substituted heterocyclic, —OSO₂—NRR where R is hydrogen or alkyl, —NRS(O)₂-alkyl, —NRS(O)₂-substituted alkyl, —NRS(O)₂-aryl, —NRS(O)₂-substituted aryl, —NRS(O)₂-heteroaryl, —NRS(O)₂-substituted heteroaryl, —NRS(O)₂-heterocyclic, —NRS(O)₂-substituted heterocyclic, —NRS(O)₂—NR-alkyl, —NRS(O)₂—NR-substituted alkyl, —NRS(O)₂—NR-aryl, —NRS(O)₂—NR-substituted aryl, —NRS(O)₂—NR-heteroaryl, —NRS(O)₂—NR-substituted heteroaryl, —NRS(O)₂—NR-heterocyclic, —NRS(O)₂—NR-substituted heterocyclic where R is hydrogen or alkyl, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-substituted arylamino, mono- and di-heteroarylamino, mono- and di-substituted heteroarylamino, mono- and di-heterocyclic amino, mono- and di-substituted heterocyclic amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic and substituted alkynyl groups having amino groups blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like or alkynyl/substituted alkynyl groups substituted with —SO₂-alkyl, —SO₂-substituted alkyl, —SO₂-alkenyl, —SO₂-substituted alkenyl, —SO₂-cycloalkyl, —SO₂-substituted cycloalkyl, —SO₂-aryl, —SO₂-substituted aryl, —SO₂-heteroaryl, —SO₂-substituted heteroaryl, —SO₂-heterocyclic, —SO₂-substituted heterocyclic and —SO₂NRR where R is hydrogen or alkyl.

“Cycloalkoxy” refers to —O-cycloalkyl groups.

“Substituted cycloalkoxy” refers to —O-substituted cycloalkyl groups. “Guanidino” refers to the groups —NRC(═NR)NRR, —NRC(═NR)NR-alkyl, —NRC(═NR)NR-substituted alkyl, —NRC(═NR)NR-alkenyl, —NRC(═NR)NR-substituted alkenyl, —NRC(═NR)NR-alkynyl, —NRC(═NR)NR-substituted alkynyl, —NRC(═NR)NR-aryl, —NRC(═NR)NR-substituted aryl, —NRC(═NR)NR-cycloalkyl, —NRC(═NR)NR-heteroaryl, —NRC(═NR)NR-substituted heteroaryl, —NRC(═NR)NR-heterocyclic, and —NRC(═NR)NR-substituted heterocyclic where each R is independently hydrogen and alkyl as well as where one of the amino groups is blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like and wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“N,N-Dimethylcarbamyloxy” refers to the group —OC(O)N(CH₃)₂.

“Guanidinosulfone” refers to the groups —NRC(═NR)NRSO₂-alkyl, —NRC(═NR)NRSO₂-substituted alkyl, —NRC(═NR)NRSO₂-alkenyl, —NRC(═NR)NRSO₂-substituted alkenyl, —NRC(═NR)NRSO₂-alkynyl, —NRC(═NR)NRSO₂-substituted alkynyl, —NRC(═NR)NRSO₂-aryl, —NRC(═NR)NRSO₂-substituted aryl, —NRC(═NR)NRSO₂-cycloalkyl, —NRC(═NR)NRSO₂-substituted cycloalkyl, —NRC(═NR)NRSO₂-heteroaryl, and —NRC(═NR)NRSO₂-substituted heteroaryl, —NRC(═NR)NRSO₂-heterocyclic, and —NRC(═NR)NRSO₂-substituted heterocyclic where each R is independently hydrogen and alkyl and wherein alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic are as defined herein.

“Halo” or “halogen” refers to fluoro, chloro, bromo and iodo and preferably is either chloro or bromo.

“Heteroaryl” refers to an aromatic carbocyclic group of from 2 to 10 carbon atoms and 1 to 4 heteroatoms selected from the group consisting of oxygen, nitrogen and sulfur within the ring. Such heteroaryl groups can have a single ring (e.g., pyridyl or furyl) or multiple condensed rings (e.g., indolizinyl or benzothienyl). Preferred heteroaryls include pyridyl, pyrrolyl, indolyl and furyl.

“Substituted heteroaryl” refers to heteroaryl groups which are substituted with from 1 to 3 substituents selected from the group consisting of hydroxy, acyl, acylamino, thiocarbonylamino, acyloxy, alkyl, substituted alkyl, alkoxy, substituted alkoxy, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, amidino, alkylamidino, thioamidino, amino, aminoacyl, aminocarbonyloxy, aminocarbonylamino, aminothiocarbonylamino, aryl, substituted aryl, aryloxy, substituted aryloxy, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, carboxylamido, cyano, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thioheteroaryl, substituted thioheteroaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheterocyclic, substituted thioheterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, halo, nitro, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —S(O)₂-alkyl, —S(O)₂-substituted alkyl, —S(O)₂-cycloalkyl, —S(O)₂-substituted cycloalkyl, —S(O)₂-alkenyl, —S(O)₂-substituted alkenyl, —S(O)₂-aryl, —S(O)₂-substituted aryl, —S(O)₂-heteroaryl, —S(O)₂-substituted heteroaryl, —S(O)₂-heterocyclic, —S(O)₂-substituted heterocyclic, —OS(O)₂-alkyl, —OS(O)₂-substituted alkyl, —OS(O)₂-aryl, —OS(O)₂-substituted aryl, —OS(O)₂-heteroaryl, —OS(O)₂-substituted heteroaryl, —OS(O)₂-heterocyclic, —OS(O)₂-substituted heterocyclic, —OSO₂—NRR where R is hydrogen or alkyl, —NRS(O)₂-alkyl, —NRS(O)₂-substituted alkyl, —NRS(O)₂-aryl, —NRS(O)₂-substituted aryl, —NRS(O)₂-heteroaryl, —NRS(O)₂-substituted heteroaryl, —NRS(O)₂-heterocyclic, —NRS(O)₂-substituted heterocyclic, —NRS(O)₂—NR-alkyl, —NRS(O)₂—NR-substituted alkyl, —NRS(O)₂—NR-aryl, —NRS(O)₂—NR-substituted aryl, —NRS(O)₂—NR-heteroaryl, —NRS(O)₂—NR-substituted heteroaryl, —NRS(O)₂—NR-heterocyclic, —NRS(O)₂—NR-substituted heterocyclic where R is hydrogen or alkyl, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-substituted arylamino, mono- and di-heteroarylamino, mono- and di-substituted heteroarylamino, mono- and di-heterocyclic amino, mono- and di-substituted heterocyclic amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic and amino groups on the substituted aryl blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like or substituted with —SO₂NRR where R is hydrogen or alkyl.

“Heteroaryloxy” refers to the group —O-heteroaryl and “substituted heteroaryloxy” refers to the group —O-substituted heteroaryl.

“Heterocycle” or “heterocyclic” refers to a saturated or unsaturated group having a single ring or multiple condensed rings, from 1 to 10 carbon atoms and from 1 to 4 hetero atoms selected from the group consisting of nitrogen, sulfur or oxygen within the ring wherein, in fused ring systems, one or more the rings can be aryl or heteroaryl.

“Substituted heterocyclic” refers to heterocycle groups which are substituted with from 1 to 3 substituents selected from the group consisting of oxo (═O), thioxo (═S), alkoxy, substituted alkoxy, acyl, acylamino, thiocarbonylamino, acyloxy, amino, amidino, alkylamidino, thioamidino, aminoacyl, aminocarbonylamino, aminothiocarbonylamino, aminocarbonyloxy, aryl, substituted aryl, aryloxy, substituted aryloxy, aryloxyaryl, substituted aryloxyaryl, halogen, hydroxyl, cyano, nitro, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheteroaryl, substituted thioheteroaryl, thioheterocyclic, substituted thioheterocyclic, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkoxy, heteroaryloxy, substituted heteroaryloxy, —C(O)O-aryl, —C(O)O-substituted aryl, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —OS(O)₂-alkyl, —OS(O)₂-substituted alkyl, —OS(O)₂-aryl, —OS(O)₂-substituted aryl, —OS(O)₂-heteroaryl, —OS(O)₂-substituted heteroaryl, —OS(O)₂-heterocyclic, —OS(O)₂-substituted heterocyclic, —OSO₂—NRR where R is hydrogen or alkyl, —NRS(O)₂-alkyl, —NRS(O)₂-substituted alkyl, —NRS(O)₂-aryl, —NRS(O)₂-substituted aryl, —NRS(O)₂-heteroaryl, —NRS(O)₂-substituted heteroaryl, —NRS(O)₂-heterocyclic, —NRS(O)₂-substituted heterocyclic, —NRS(O)₂—NR-alkyl, —NRS(O)₂—NR-substituted alkyl, —NRS(O)₂—NR-aryl, —NRS(O)₂—NR-substituted aryl, —NRS(O)₂—NR-heteroaryl, —NRS(O)₂—NR-substituted heteroaryl, —NRS(O)₂—NR-heterocyclic, —NRS(O)₂—NR-substituted heterocyclic where R is hydrogen or alkyl, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-substituted arylamino, mono- and di-heteroarylamino, mono- and di-substituted heteroarylamino, mono- and di-heterocyclic amino, mono- and di-substituted heterocyclic amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic and substituted alkynyl groups having amino groups blocked by conventional blocking groups such as Boc, Cbz, formyl, and the like or alkynyl/substituted alkynyl groups substituted with —SO₂-alkyl, —SO₂-substituted alkyl, —SO₂-alkenyl, —SO₂-substituted alkenyl, —SO₂-cycloalkyl, —SO₂-substituted cycloalkyl, —SO₂-aryl, —SO₂-substituted aryl, —SO₂-heteroaryl, —SO₂-substituted heteroaryl, —SO₂-heterocyclic, —SO₂-substituted heterocyclic and —SO₂NRR where R is hydrogen or alkyl.

Examples of heterocycles and heteroaryls include, but are not limited to, azetidine, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyrimidine, pyridazine, indolizine, isoindole, indole, dihydroindole, indazole, purine, quinolizine, isoquinoline, quinoline, phthalazine, naphthylpyridine, quinoxaline, quinazoline, cinnoline, pteridine, carbazole, carboline, phenanthridine, acridine, phenanthroline, isothiazole, phenazine, isoxazole, phenoxazine, phenothiazine, imidazolidine, imidazoline, piperidine, piperazine, indoline, phthalimide, 1,2,3,4-tetrahydroisoquinoline, 4,5,6,7-tetrahydrobenzo[b]thiophene, thiazole, thiazolidine, thiophene, benzo[b]thiophene, morpholinyl, thiomorpholinyl (also referred to as thiamorpholinyl), piperidinyl, pyrrolidine, tetrahydrofuranyl, and the like.

“Heterocyclyloxy” refers to the group —O-heterocyclic and “substituted heterocyclyloxy” refers to the group —O-substituted heterocyclic.

“Thiol” refers to the group —SH.

“Thioalkyl” refers to the groups —S-alkyl.

“Substituted thioalkyl” refers to the group —S-substituted alkyl.

“Thiocycloalkyl” refers to the groups —S-cycloalkyl.

“Substituted thiocycloalkyl” refers to the group —S-substituted cycloalkyl.

“Thioaryl” refers to the group —S-aryl and “substituted thioaryl” refers to the group —S-substituted aryl.

“Thioheteroaryl” refers to the group —S-heteroaryl and “substituted thioheteroaryl” refers to the group —S-substituted heteroaryl.

“Thioheterocyclic” refers to the group —S-heterocyclic and “substituted thioheterocyclic” refers to the group —S-substituted heterocyclic.

“Pharmaceutically acceptable salt” refers to pharmaceutically acceptable salts of a compound of Formula I/IA which salts are derived from a variety of organic and inorganic counter ions well known in the art and include, by way of example only, sodium, potassium, calcium, magnesium, ammonium, tetraalkylammonium, and the like; and when the molecule contains a basic functionality, salts of organic or inorganic acids, such as hydrochloride, hydrobromide, tartrate, mesylate, acetate, maleate, oxalate and the like.

Compound Preparation

The compounds of this invention can be prepared from readily available starting materials using the following general methods and procedures. It will be appreciated that where typical or preferred process conditions (i.e., reaction temperatures, times, mole ratios of reactants, solvents, pressures, etc.) are given, other process conditions can also be used unless otherwise stated. Optimum reaction conditions may vary with the particular reactants or solvent used, but such conditions can be determined by one skilled in the art by routine optimization procedures.

Additionally, as will be apparent to those skilled in the art, conventional protecting groups may be necessary to prevent certain functional groups from undergoing undesired reactions. Suitable protecting groups for various functional groups as well as suitable conditions for protecting and deprotecting particular functional groups are well known in the art. For example, numerous protecting groups are described in T. W. Greene and G. M. Wuts, Protecting Groups in Organic Synthesis, Second Edition, Wiley, New York, 1991, and references cited therein.

Furthermore, the compounds of this invention will typically contain one or more chiral centers. Accordingly, if desired, such compounds can be prepared or isolated as pure stereoisomers, i.e., as individual enantiomers or diastereomers, or as stereoisomer-enriched mixtures. All such stereoisomers (and enriched mixtures) are included within the scope of this invention, unless otherwise indicated. Pure stereoisomers (or enriched mixtures) may be prepared using, for example, optically active starting materials or stereoselective reagents well-known in the art. Alternatively, racemic mixtures of such compounds can be separated using, for example, chiral column chromatography, chiral resolving agents and the like.

In a preferred method of synthesis, the compounds of formula I and IA wherein Q is —C(O)NR⁷— are prepared by first coupling an amino acid of formula II:

wherein R² and R3 are as defined herein (e.g., in formula I and IIA), with a sulfonyl chloride of formula III:

wherein R¹ is as defined herein, to provide an N-sulfonyl amino acid of formula IV:

wherein R¹-R³ are as defined herein.

This reaction is typically conducted by reacting the amino acid of formula II with at least one equivalent, preferably about 1.1 to about 2 equivalents, of sulfonyl chloride III in an inert diluent such as dichloromethane and the like. Generally, the reaction is conducted at a temperature ranging from about −70° C. to about 40° C. for about 1 to about 24 hours. Preferably, this reaction is conducted in the presence of a suitable base to scavenge the acid generated during the reaction. Suitable bases include, by way of example, tertiary amines, such as triethylamine, diisopropylethylamine, N-methylmorpholine and the like. Alternatively, the reaction can be conducted under Schotten-Baumann-type conditions using aqueous alkali, such as sodium hydroxide and the like, as the base. Upon completion of the reaction, the resulting N-sulfonyl amino acid IV is recovered by conventional methods including neutralization, extraction, precipitation, chromatography, filtration, and the like.

The amino acids of formula II employed in the above reaction are either known compounds or compounds that can be prepared from known compounds by conventional synthetic procedures. Examples of suitable amino acids for use in this reaction include, but are not limited to, L-proline, trans-4-hydroxyl-L-proline, cis-4-hydroxyl-L-proline, trans-3-phenyl-L-proline, cis-3-phenyl-L-proline, L-(2-methyl)proline, L-pipecolinic acid, L-azetidine-2-carboxylic acid, L-indoline-2-carboxylic acid, L-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid, L-thiazolidine-4-carboxylic acid, L-(5,5-dimethyl)thiazolidine-4-carboxylic acid, L-thiamorpholine-3-carboxylic acid, glycine, 2-tert-butylglycine, D,L-phenylglycine, L-alanine, α-methylalanine, N-methyl-L-phenylalanine, L-diphenylalanine, sarcosine, D,L-phenylsarcosine, L-aspartic acid β-tert-butyl ester, L-glutamic acid γ-tert-butyl ester, L-(O-benzyl)serine, 1-aminocyclopropanecarboxylic acid, 1-aminocyclobutanecarboxylic acid, 1-aminocyclopentanecarboxylic acid (cycloleucine) 1-aminocyclohexanecarboxylic acid, L-serine and the like. If desired, the corresponding carboxylic acid esters of the amino acids of formula II, such as the methyl esters, ethyl esters and the like, can be employed in the above reaction with the sulfonyl chloride III. Subsequent hydrolysis of the ester group to the carboxylic acid using conventional reagents and conditions, i.e., treatment with an alkali metal hydroxide in an inert diluent such as methanol/water, then provides the N-sulfonyl amino acid IV.

Similarly, the sulfonyl chlorides of formula III employed in the above reaction are either known compounds or compounds that can be prepared from known compounds by conventional synthetic procedures. Such compounds are typically prepared from the corresponding sulfonic acid, i.e., from compounds of the formula R¹—SO₃H where R¹ is as defined above, using phosphorous trichloride and phosphorous pentachloride. This reaction is generally conducted by contacting the sulfonic acid with about 2 to 5 molar equivalents of phosphorous trichloride and phosphorous pentachloride, either neat or in an inert solvent, such as dichloromethane, at temperature in the range of about 0° C. to about 80° C. for about 1 to about 48 hours to afford the sulfonyl chloride. Alternatively, the sulfonyl chlorides of formula m can be prepared from the corresponding thiol compound, i.e., from compounds of the formula R¹—SH where R¹ is as defined herein, by treating the thiol with chlorine (Cl₂) and water under conventional reaction conditions.

Examples of sulfonyl chlorides suitable for use in this, invention include, but are not limited to, methanesulfonyl chloride, 2-propanesulfonyl chloride, 1-butanesulfonyl chloride, benzenesulfonyl chloride, 1-naphthalenesulfonyl chloride, 2-naphthalenesulfonyl chloride, p-toluenesulfonyl chloride, α-toluenesulfonyl chloride, 4-acetamidobenzenesulfonyl chloride, 4-amidinobenzenesulfonyl chloride, 4-tert-butylbenzenesulfonyl chloride, 4-bromobenzenesulfonyl chloride, 2-carboxybenzenesulfonyl chloride, 4-cyanobenzenesulfonyl chloride, 3,4-dichlorobenzenesulfonyl chloride, 3,5-dichlorobenzenesulfonyl chloride, 3,4-dimethoxybenzenesulfonyl chloride, 3,5-ditrifluoromethylbenzenesulfonyl chloride, 4-fluorobenzenesulfonyl chloride, 4-methoxybenzenesulfonyl chloride, 2-methoxycarbonylbenzenesulfonyl chloride, 4-methylamidobenzenesulfonyl chloride, 4-nitrobenzenesulfonyl chloride, 4-thioamidobenzenesulfonyl chloride, 4-trifluoromethylbenzenesulfonyl chloride, 4-trifluoromethoxybenzenesulfonyl chloride, 2,4,6-trimethylbenzenesulfonyl chloride, 2-phenylethanesulfonyl chloride, 2-thiophenesulfonyl chloride, 5-chloro-2-thiophenesulfonyl chloride, 2,5-dichloro-4-thiophenesulfonyl chloride, 2-thiazolesulfonyl chloride, 2-methyl-4-thiazolesulfonyl chloride, 1-methyl-4-imidazolesulfonyl chloride, 1-methyl-4-pyrazolesulfonyl chloride, 5-chloro-1,3-dimethyl-4-pyrazolesulfonyl chloride, 3-pyridinesulfonyl chloride, 2-pyrimidinesulfonyl chloride and the like. If desired, a sulfonyl fluoride, sulfonyl bromide or sulfonic acid anhydride may be used in place of the sulfonyl chloride in the above reaction to form the N-sulfonyl amino acids of formula IV.

The intermediate N-sulfonyl amino acids of formula IV can also be prepared by reacting a sulfonamide of formula V:

wherein R¹ and R² are as defined herein, with a carboxylic acid derivative of the formula L(R³)CHCOOR where L is a leaving group, such as chloro, bromo, iodo, mesylate, tosylate and the like, R³ is as defined herein and R is hydrogen or an alkyl group. This reaction is typically conducted by contacting the sulfonamide V with at least one equivalent, preferably 1.1 to 2 equivalents, of the carboxylic acid derivative in the presence of a suitable base, such as triethylamine, in an inert diluent, such as DMF, at a temperature ranging from about 24° C. to about 37° C. for about 0.5 to about 4 hours. This reaction is further described in Zuckermann et al., J. Am. Chem. Soc., 1992, 114, 10646-10647. Preferred carboxylic acid derivatives for use in this reaction are α-chloro and α-bromocarboxylic acid esters such as tert-butyl bromoacetate and the like. When a carboxylic acid ester is employed in his reaction, the ester group is subsequently hydrolyzed using conventional procedures to afford an N-sulfonyl amino acid of formula IV.

The compounds of formula I/IA are then prepared by coupling the intermediate N-sulfonyl amino acid of formula IV with an amino acid derivative of formula VI:

wherein R⁵-R⁷ are as defined herein. This coupling reaction is typically conducted using well-known coupling reagents such as carbodiimides, BOP reagent (benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphonate) and the like. Suitable carbodiimides include, by way of example, dicyclohexylcarbodiimide (DCC), 1-(3-dimethylamino-propyl)-3-ethylcarbodiimide (EDC) and the like. If desired, polymer supported forms of carbodiimide coupling reagents may also be used including, for example, those described in Tetrahedron Letters, 34(48), 7685 (1993). Additionally, well-known coupling promoters, such as N-hydroxysuccinimide, 1-hydroxybenzotriazole and the like, may be used to facilitate the coupling reaction.

This coupling reaction is typically conducted by contacting the N-sulfonylamino acid IV with about 1 to about 2 equivalents of the coupling reagent and at least one equivalent, preferably about 1 to about 1.2 equivalents, of amino acid derivative VI in an inert diluent, such as dichloromethane, chloroform, acetonitrile, tetrahydrofuran, N,N-dimethylformamide and the like. Generally, this reaction is conducted at a temperature ranging from about 0° C. to about 37° C. for about 12 to about 24 hours. Upon completion of the reaction, the compound of formula I/IA is recovered by conventional methods including neutralization, extraction, precipitation, chromatography, filtration, and the like.

Alternatively, the N-sulfonyl amino acid IV can be converted into an acid halide and the acid halide coupled with amino acid derivative VI to provide compounds of formula I/IA. The acid halide of VI can be prepared by contacting VI with an inorganic acid halide, such as thionyl chloride, phosphorous trichloride, phosphorous tribromide or phosphorous pentachloride, or preferably, with oxalyl chloride under conventional conditions. Generally, this reaction is conducted using about 1 to 5 molar equivalents of the inorganic acid halide or oxalyl chloride, either neat or in an inert solvent, such as dichloromethane or carbon tetrachloride, at temperature in the range of about 0° C. to about 80° C. for about 1 to about 48 hours. A catalyst, such as DMF, may also be used in this reaction.

The acid halide of N-sulfonyl amino acid IV is then contacted with at least one equivalent, preferably about 1.1 to about 1.5 equivalents, of amino acid derivative VI in an inert diluent, such as dichloromethane, at a temperature ranging from about −70° C. to about 40° C. for about 1 to about 24 hours. Preferably, this reaction is conducted in the presence of a suitable base to scavenge the acid generated during the reaction. Suitable bases include, by way of example, tertiary amines, such as triethylamine, diisopropylethylamine, N-methylmorpholine and the like. Alternatively, the reaction can be conducted under Schotten-Baumann-type conditions using aqueous alkali, such as sodium hydroxide and the like. Upon completion of the reaction, the compound of formula I/IA is recovered by conventional methods including neutralization, extraction, precipitation, chromatography, filtration, and the like.

Alternatively, the compounds of formula I/IA can be prepared by first forming a diamino acid derivative of formula VII:

wherein R², R³, R⁵, R⁶ and R⁷ are as defined herein. The diamino acid derivatives of formula VII can be readily prepared by coupling an amino acid of formula II with an amino acid derivative of formula VI using conventional amino acid coupling techniques and reagents, such carbodiimides, BOP reagent and the like, as described above. Diamino acid VII can then be sulfonated using a sulfonyl chloride of formula m and using the synthetic procedures described above to provide a compound of formula I/IA.

The amino acid derivatives of formula VI employed in the above reactions are either known compounds or compounds that can be prepared from known compounds by conventional synthetic procedures. For example, amino acid derivatives of formula VI can be prepared by C-alkylating commercially available diethyl 2-acetamidomalonate (Aldrich, Milwaukee, Wis., USA) with an alkyl or substituted alkyl halide. This reaction is typically conducted by treating the diethyl 2-acetamidomalonate with at least one equivalent of sodium ethoxide and at least one equivalent of an alkyl or substituted alkyl halide in refluxing ethanol for about 6 to about 12 hours. The resulting C-alkylated malonate is then deacetylated, hydrolyzed and decarboxylated by heating in aqueous hydrochloric acid at reflux for about 6 to about 12 hours to provide the amino acid, typically as the hydrochloride salt.

Examples of amino acid derivatives of formula VI suitable for use in the above reactions include, but are not limited to, L-tyrosine methyl ester, L-3,5-diiodotyrosine methyl ester, L-3-iodotyrosine methyl ester, β-(4-hydroxy-naphth-1-yl)-L-alanine methyl ester, β-(6-hydroxy-naphth-2-yl)-L-alanine methyl ester, and the like. If desired, of course, other esters or amides of the above-described compounds may also be employed.

For ease of synthesis, the compounds of formula I are typically prepared as an ester, i.e., where R⁶ is an alkoxy or substituted alkoxy group and the like. If desired, the ester group can be hydrolysed using conventional conditions and reagents to provide the corresponding carboxylic acid. Typically, this reaction is conducted by treating the ester with at least one equivalent of an alkali metal hydroxide, such as lithium, sodium or potassium hydroxide, in an inert diluent, such as methanol or mixtures of methanol and water, at a temperature ranging about 0° C. to about 24° C. for about 1 to about 10 hours. Alternatively, benzyl esters may be removed by hydrogenolysis using a palladium catalyst, such as palladium on carbon. The resulting carboxylic acids may be coupled, if desired, to amines such as β-alanine ethyl ester, hydroxyamines such as hydroxylamine and N-hydroxysuccinimide, alkoxyamines and substituted alkoxyamines such as O-methylhydroxylamine and O-benzylhydroxylamine, and the like, using conventional coupling reagents and conditions as described above.

As will be apparent to those skilled in the art, other functional groups present on any of the substituents of the compounds of formula I can be readily modified or derivatized either before or after the above-described coupling reactions using well-known synthetic procedures. For example, a nitro group present on a substituent of a compound of formula I/IA or an intermediate thereof may be readily reduced by hydrogenation in the presence of a palladium catalyst, such as palladium on carbon, to provide the corresponding amino group. This reaction is typically conducted at a temperature of from about 20° C. to about 50° C. for about 6 to about 24 hours in an inert diluent, such as methanol. Compounds having a nitro group on, e.g., the R³ substituent, can be prepared, for example, by using a 4-nitrophenylalanine derivative and the like in the above-described coupling reactions.

Similarly, a pyridyl group can be hydrogenated in the presence of a platinum catalyst, such as platinum oxide, in an acidic diluent to provide the corresponding piperidinyl analogue. Generally, this reaction is conducted by treating the pyridine compound with hydrogen at a pressure ranging from about 20 psi to about 60 psi, preferably about 40 psi, in the presence of the catalyst at a temperature of about 20° C. to about 50° C. for about 2 to about 24 hours in an acidic diluent, such as a mixture of methanol and aqueous hydrochloric acid. Compounds having a pyridyl group can be readily prepared by using, for example, β-(2-pyridyl)-, β-(3-pyridyl)- or β-(4-pyridyl)-L-alanine derivatives in the above-described coupling reactions.

Additionally, when a substituent of a compound of formula I/A or an intermediate thereof contains a primary or secondary amino group, such amino groups can be further derivatized either before or after the above coupling reactions to provide, by way of example, amides, sulfonamides, ureas, thioureas, carbamates, secondary or tertiary amines and the like. Compounds having a primary amino group on such a substituent may be prepared, for example, by reduction of the corresponding nitro compound as described above. Alternatively, such compounds can be prepared by using an amino acid derivative of formula VI derived from lysine, 4-aminophenylalanine and the like in the above-described coupling reactions.

By way of illustration, a compound of formula I/IA or an intermediate thereof having a substituent containing a primary or secondary amino group can be readily N-acylated using conventional acylating reagents and conditions to provide the corresponding amide. This acylation reaction is typically conducted by treating the amino compound with at least one equivalent, preferably about 1.1 to about 1.2 equivalents, of a carboxylic acid in the presence of a coupling reagent such as a carbodiimide, BOP reagent (benzotriazol-1-yloxy-tris(dimethylamino)-phosphonium hexafluorophosphonate) and the like, in an inert diluent, such as dichloromethane, chloroform, acetonitrile, tetrahydrofuran, N,N-dimethylformamide and the like, at a temperature ranging from about 0° C. to about 37° C. for about 4 to about 24 hours. Preferably, a promoter, such as N-hydroxysuccinimide, 1-hydroxybenzotriazole and the like, is used to facilitate the acylation reaction. Examples of carboxylic acids suitable for use in this reaction include, but are not limited to, N-tert-butyloxycarbonylglycine, N-tert-butyloxycarbonyl-L-phenylalanine, N-tert-butyloxycarbonyl-L-aspartic acid benzyl ester, benzoic acid, N-tert-butyloxycarbonylisonipecotic acid, N-methylisonipecotic acid, N-tert-butyloxycarbonylnipecotic acid, N-tert-butyloxycarbonyl-L-tetrahydroisoquinoline-3-carboxylic acid, N-(toluene-4-sulfonyl)-L-proline and the like.

Alternatively, a compound of formula I/IA or an intermediate thereof containing a primary or secondary amino group can be N-acylated using an acyl halide or a carboxylic acid anhydride to form the corresponding amide. This reaction is typically conducted by contacting the amino compound with at least one equivalent, preferably about 1.1 to about 1.2 equivalents, of the acyl halide or carboxylic acid anhydride in an inert diluent, such as dichloromethane, at a temperature ranging from about of about −70° C. to about 40° C. for about 1 to about 24 hours. If desired, an acylation catalyst such as 4-(N,N-dimethylamino)pyridine may be used to promote the acylation reaction. The acylation reaction is preferably conducted in the presence of a suitable base to scavenge the acid generated during the reaction. Suitable bases include, by way of example, tertiary amines, such as triethylamine, diisopropylethylamine, N-methylmorpholine and the like. Alternatively, the reaction can be conducted under Schotten-Baumann-type conditions using aqueous alkali, such as sodium hydroxide and the like.

Examples of acyl halides and carboxylic acid anhydrides suitable for use in this reaction include, but are not limited to, 2-methylpropionyl chloride, trimethylacetyl chloride, phenylacetyl chloride, benzoyl chloride, 2-bromobenzoyl chloride, 2-methylbenzoyl chloride, 2-trifluoromethylbenzoyl chloride, isonicotinoyl chloride, nicotinoyl chloride, picolinoyl chloride, acetic anhydride, succinic anhydride and the like. Carbamyl chlorides, such as N,N-dimethylcarbamyl chloride, N,N-diethylcarbamyl chloride and the like, can also be used in this reaction to provide ureas. Similarly, dicarbonates, such as di-tert-butyl dicarbonate, may be employed to provide carbamates.

In a similar manner, a compound of formula I/IA or an intermediate thereof containing a primary or secondary amino group may be N-sulfonated to form a sulfonamide using a sulfonyl halide or a sulfonic acid anhydride. Sulfonyl halides and sulfonic acid anhydrides suitable for use in this reaction include, but are not limited to, methanesulfonyl chloride, chloromethanesulfonyl chloride, p-toluenesulfonyl chloride, trifluoromethanesulfonic anhydride and the like. Similarly, sulfamoyl chlorides, such as dimethylsulfamoyl chloride, can be used to provide sulfamides (e.g., >N—SO₂—N<).

Additionally, a primary and secondary amino group present on a substituent of a compound of formula I/IA or an intermediate thereof can be reacted with an isocyanate or a thioisocyanate to give a urea or thiourea, respectively. This reaction is typically conducted by contacting the amino compound with at least one equivalent, preferably about 1.1 to about 1.2 equivalents, of the isocyanate or thioisocyanate in an inert diluent, such as toluene and the like, at a temperature ranging from about 24° C. to about 37° C. for about 12 to about 24 hours. The isocyanates and thioisocyanates used in this reaction are commercially available or can be prepared from commercially available compounds using well-known synthetic procedures. For example, isocyanates and thioisocyanates are readily prepared by reacting the appropriate amine with phosgene or thiophosgene. Examples of isocyanates and thioisocyanates suitable for use in this reaction include, but are not limited to, ethyl isocyanate, n-propyl isocyanate, 4-cyanophenyl isocyanate, 3-methoxyphenyl isocyanate, 2-phenylethyl isocyanate, methyl thioisocyanate, ethyl thioisocyanate, 2-phenylethyl thioisocyanate, 3-phenylpropyl thioisocyanate, 3-(N,N-diethylamino)propyl thioisocyanate, phenyl thioisocyanate, benzyl thioisocyanate, 3-pyridyl thioisocyanate, fluorescein isothiocyanate (isomer I), and the like.

Furthermore, when a compound of formula I/IA or an intermediate thereof contains a primary or secondary amino group, the amino group can be reductively alkylated using aldehydes or ketones to form a secondary or tertiary amino group. This reaction is typically conducted by contacting the amino compound with at least one equivalent, preferably about 1.1 to about 1.5 equivalents, of an aldehyde or ketone and at least one equivalent based on the amino compound of a metal hydride reducing agent, such as sodium cyanoborohydride, in an inert diluent, such as methanol, tetrahydrofuran, mixtures thereof and the like, at a temperature ranging from about 0° C. to about 50° C. for about 1 to about 72 hours. Aldehydes and ketones suitable for use in this reaction include, by way of example, benzaldehyde, 4-chlorobenzaldehyde, valeraldehyde and the like.

In a similar manner, when a compound of formula I/IA or an intermediate thereof has a substituent containing a hydroxyl group, the hydroxyl group can be further modified or derivatized either before or after the above coupling reactions to provide, by way of example, ethers, carbamates and the like. Compounds having a hydroxyl group on the R⁵ substituent, for example, can be prepared using an amino acid derivative of formula VI derived from tyrosine and the like in the above-described reactions.

By way of example, a compound of formula I/IA or an intermediate thereof having a substituent containing a hydroxyl group can be readily O-alkylated to form ethers. This O-alkylation reaction is typically conducted by contacting the hydroxy compound with a suitable alkali or alkaline earth metal base, such as potassium carbonate, in an inert diluent, such as acetone, 2-butanone and the like, to form the alkali or alkaline earth metal salt of the hydroxyl group. This salt is generally not isolated, but is reacted in situ with at least one equivalent of an alkyl or substituted alkyl halide or sulfonate, such as an alkyl chloride, bromide, iodide, mesylate or tosylate, to afford the ether. Generally, this reaction is conducted at a temperature ranging from about 60° C. to about 150° C. for about 24 to about 72 hours. Preferably, a catalytic amount of sodium or potassium iodide is added to the reaction mixture when an alkyl chloride or bromide is employed in the reaction.

Examples of alkyl or substituted alkyl halides and sulfonates suitable for use in this reaction include, but are not limited to, tert-butyl bromoacetate, N-tert-butyl chloroacetamide, 1-bromoethylbenzene, ethyl α-bromophenylacetate, 2-(N-ethyl-N-phenylamino)ethyl chloride, 2-(N,N-ethylamino)ethyl chloride, 2-(N,N-diisopropylamino)ethyl chloride, 2-(N,N-dibenzylamino)ethyl chloride, 3-(N,N-ethylamino)propyl chloride, 3-(N-benzyl-N-methylamino)propyl chloride, N-(2-chloroethyl)morpholine, 2-(hexamethyleneimino)ethyl chloride, 3-(N-methylpiperazine)propyl chloride, 1-(3-chlorophenyl)-4-(3-chloropropyl)piperazine, 2-(4-hydroxy-4-phenylpiperidine)ethyl chloride, N-tert-butyloxycarbonyl-3-piperidinemethyl tosylate and the like.

Alternatively, a hydroxyl group present on a substituent of a compound of formula I/IA or an intermediate thereof can be O-alkylating using the Mitsunobu reaction. In this reaction, an alcohol, such as 3-(N,N-dimethylamino)-1-propanol and the like, is reacted with about 1.0 to about 1.3 equivalents of triphenylphosphine and about 1.0 to about 1.3 equivalents of diethyl azodicarboxylate in an inert diluent, such as tetrahydrofuran, at a temperature ranging from about −10° C. to about 5° C. for about 0.25 to about 1 hour. About 1.0 to about 1.3 equivalents of a hydroxy compound, such as N-tert-butyltyrosine methyl ester, is then added and the reaction mixture is stirred at a temperature of about 0° C. to about 30° C. for about 2 to about 48 hours to provide the O-alkylated product.

In a similar manner, a compound of formula I/IA or an intermediate thereof containing a aryl hydroxy group can be reacted with an aryl iodide to provide a diaryl ether. Generally, this reaction is conducted by forming the alkali metal salt of the hydroxyl group using a suitable base, such as sodium hydride, in an inert diluent such as xylenes at a temperature of about −25° C. to about 10° C. The salt is then treated with about 1.1 to about 1.5 equivalents of cuprous bromide dimethyl sulfide complex at a temperature ranging from about 10° C. to about 30° C. for about 0.5 to about 2.0 hours, followed by about 1.1 to about 1.5 equivalents of an aryl iodide, such as sodium 2-iodobenzoate and the like. The reaction is then heated to about 70° C. to about 150° C. for about 2 to about 24 hours to provide the diaryl ether.

Additionally, a hydroxy-containing compound can also be readily derivatized to form a carbamate. In one method for preparing such carbamates, a hydroxy compound of formula I/IA or an intermediate thereof is contacted with about 1.0 to about 1.2 equivalents of 4-nitrophenyl chloroformate in an inert diluent, such as dichloromethane, at a temperature ranging from about −25° C. to about 0° C. for about 0.5 to about 2.0 hours. Treatment of the resulting carbonate with an excess, preferably about 2 to about 5 equivalents, of a trialkylamine, such as triethylamine, for about 0.5 to 2 hours, followed by about 1.0 to about 1.5 equivalents of a primary or secondary amine provides the carbamate. Examples of amines suitable for using in this reaction include, but are not limited to, piperazine, 1-methylpiperazine, 1-acetylpiperazine, morpholine, thiomorpholine, pyrrolidine, piperidine and the like.

Alternatively, in another method for preparing carbamates, a hydroxy-containing compound is contacted with about 1.0 to about 1.5 equivalents of a carbamyl chloride in an inert diluent, such as dichloromethane, at a temperature ranging from about 25° C. to about 70° C. for about 2 to about 72 hours. Typically, this reaction is conducted in the presence of a suitable base to scavenge the acid generated during the reaction. Suitable bases include, by way of example, tertiary amines, such as triethylamine, diisopropylethylamine, N-methylmorpholine and the like. Additionally, at least one equivalent (based on the hydroxy compound) of 4-(N,N-dimethylamino)pyridine is preferably added to the reaction mixture to facilitate the reaction. Examples of carbamyl chlorides suitable for use in this reaction include, by way of example, dimethylcarbamyl chloride, diethylcarbamyl chloride and the like.

Likewise, when a compound of formula I/IA or an intermediate thereof contains a primary or secondary hydroxyl group, such hydroxyl groups can be readily converted into a leaving group and displaced to form, for example, amines, sulfides and fluorides. For example, derivatives of 4-hydroxy-L-proline can be converted into the corresponding 4-amino, 4-thio or 4-fluoro-L-proline derivatives via nucleophilic displacement of the derivatized hydroxyl group. Generally, when a chiral compound is employed in these reactions, the stereochemistry at the carbon atom attached to the derivatized hydroxyl group is typically inverted.

These reactions are typically conducted by first converting the hydroxyl group into a leaving group, such as a tosylate, by treatment of the hydroxy compound with at least one equivalent of a sulfonyl halide, such as p-toluenesulfonyl chloride and the like, in pyridine. This reaction is generally conducted at a temperature of from about 0° C. to about 70° C. for about 1 to about 48 hours. The resulting tosylate can then be readily displaced with sodium azide, for example, by contacting the tosylate with at least one equivalent of sodium azide in an inert diluent, such as a mixture of N,N-dimethylformamide and water, at a temperature ranging from about 0° C. to about 37° C. for about 1 to about 12 hours to provide the corresponding azido compound. The azido group can then be reduced by, for example, hydrogenation using a palladium on carbon catalyst to provide the amino (—NH₂) compound.

Similarly, a tosylate group can be readily displaced by a thiol to form a sulfide. This reaction is typically conducted by contacting the tosylate with at least one equivalent of a thiol, such as thiophenol, in the presence of a suitable base, such as 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), in an inert diluent, such as N,N-dimethylformamide, at a temperature of from about 0° C. to about 37° C. for about 1 to about 12 hours to provide the sulfide. Additionally, treatment of a tosylate with morpholinosulfur trifluoride in an inert diluent, such as dichloromethane, at a temperature ranging from about 0° C. to about 37° C. for about 12 to about 24 hours affords the corresponding fluoro compound.

Furthermore, a compound of formula I/IA or an intermediate thereof having a substituent containing an iodoaryl group, for example, when R⁵ is a (4-iodophenyl)methyl group, can be readily converted either before or after the above coupling reactions into a biaryl compound. Typically, this reaction is conducted by treating the iodoaryl compound with about 1.1 to about 2 equivalents of an arylzinc iodide, such as 2-(methoxycarbonyl)phenylzinc iodide, in the presence of a palladium catalyst, such as palladium tetra(triphenylphosphine), in an inert diluent, such as tetrahydrofuran, at a temperature ranging from about 24° C. to about 30° C. until the reaction is complete. This reaction is further described, for example, in Rieke, J. Org. Chem. 1991, 56, 1445.

In some cases, the compounds of formula MIA or intermediates thereof may contain substituents having one or more sulfur atoms. Such sulfur atoms will be present, for example, when the amino acid of formula II employed in the above reactions is derived from L-thiazolidine-4-carboxylic acid, L-(5,5-dimethyl)thiazolidine-4-carboxylic acid, L-thiamorpholine-3-carboxylic acid and the like. When present, such sulfur atoms can be oxidized either before or after the above coupling reactions to provide a sulfoxide or sulfone compound using conventional reagents and reaction conditions. Suitable reagents for oxidizing a sulfide compound to a sulfoxide include, by way of example, hydrogen peroxide, 3-chloroperoxybenzoic acid (MCPBA), sodium periodate and the like. The oxidation reaction is typically conducted by contacting the sulfide compound with about 0.95 to about 1.1 equivalents of the oxidizing reagent in an inert diluent, such as dichloromethane, at a temperature ranging from about −50° C. to about 75° C. for about 1 to about 24 hours. The resulting sulfoxide can then be further oxidized to the corresponding sulfone by contacting the sulfoxide with at least one additional equivalent of an oxidizing reagent, such as hydrogen peroxide, MCPBA, potassium permanganate and the like. Alternatively, the sulfone can be prepared directly by contacting the sulfide with at least two equivalents, and preferably an excess, of the oxidizing reagent. Such reactions are described further in March, “Advanced Organic Chemistry”, 4th Ed., pp. 1202-1202, Wiley Publishers, (1992).

As described above, the compounds of formula I/IA having an R² substituent other an hydrogen can be prepared using an N-substituted amino acid of formula II, such as sarcosine, N-methyl-L-phenylalanine and the like, in the above-described coupling reactions. Alternatively, such compounds can be prepared by N-alkylation of a, sulfonamide of formula I or IV (where R² is hydrogen) using conventional synthetic procedures. Typically, this N-alkylation reaction is conducted by contacting the sulfonamide with at least one equivalent, preferably 1.1 to 2 equivalents, of an alkyl or substituted alkyl halide in the presence of a suitable base, such as potassium carbonate, in an inert diluent, such as acetone, 2-butanone and the like, at a temperature ranging from about 25° C. to about 70° C. for about 2 to about 48 hours. Examples of alkyl or substituted alkyl halides suitable for use in this reaction include, but are not limited to, methyl iodide, and the like.

Additionally, the sulfonamides of formula I or IV wherein R² is hydrogen and R¹ is a 2-alkoxycarbonylaryl group can be intramolecularly cyclized to form 1,2-benzisothiazol-3-one derivatives or analogues thereof. This reaction is typically conducted by treating a sulfonamide, such as N-(2-methoxycarbonylphenylsulfonyl)glycine-L-phenylalanine benzyl ester, with about 1.0 to 1.5 equivalents of a suitable base, such as an alkali metal hydride, in a inert diluent, such as tetrahydrofuran, at a temperature ranging from about 0° C. to about 30° C. for about 2 to about 48 hours to afford the cyclized 1,2-benzisothiazol-3-one derivative.

Lastly, the compounds of formula I where Q is —C(S)NR⁷— are prepared by using an amino thionoacid derivative in place of amino acid II in the above described synthetic procedures. Such amino thionoacid derivatives can be prepared by the procedures described in Shalaky, et al., J. Org. Chem., 61:9045-9048 (1996) and Brain, et al., J. Org. Chem., 62:3808-3809 (1997) and references cited therein.

Pharmaceutical Formulations

When employed as pharmaceuticals, the compounds of formula I and IA are usually administered in the form of pharmaceutical compositions. These compounds can be administered by a variety of routes including oral, rectal, transdermal, subcutaneous, intravenous, intramuscular, and intranasal. These compounds are effective as both injectable and oral compositions. Such compositions are prepared in a manner well known in the pharmaceutical art and comprise at least one active compound.

This invention also includes pharmaceutical compositions which contain, as the-active ingredient, one or more of the compounds of formula I and IA above associated with pharmaceutically acceptable carriers. In making the compositions of this invention, the active ingredient is usually mixed with an excipient, diluted by an excipient or enclosed within such a carrier which can be in the form of a capsule, sachet, paper or other container. When the excipient serves as a diluent, it can be a solid, semi-solid, or liquid material, which acts as a vehicle, carrier or medium for the active ingredient. Thus, the compositions can be in the form of tablets, pills, powders, lozenges, sachets, cachets, elixirs, suspensions, emulsions, solutions, syrups, aerosols (as a solid or in a liquid medium), ointments containing, for example, up to 10% by weight of the active compound, soft and hard gelatin capsules, suppositories, sterile injectable solutions, and sterile packaged powders.

In preparing a formulation, it may be necessary to mill the active compound to provide the appropriate particle size prior to combining with the other ingredients. If the active compound is substantially insoluble, it ordinarily is milled to a particle size of less than 200 mesh. If the active compound is substantially water soluble, the particle size is normally adjusted by milling to provide a substantially uniform distribution in the formulation, e.g. about 40 mesh.

Some examples of suitable excipients include lactose, dextrose, sucrose, sorbitol, mannitol, starches, gum acacia, calcium phosphate, alginates, tragacanth, gelatin, calcium silicate, microcrystalline cellulose, polyvinylpyrrolidone, cellulose, water, syrup, and methyl cellulose. The formulations can additionally include: lubricating agents such as talc, magnesium stearate, and mineral oil; wetting agents; emulsifying and suspending agents; preserving agents such as methyl- and propylhydroxy-benzoates; sweetening agents; and flavoring agents. The compositions of the invention can be formulated so as to provide quick, sustained or delayed release of the active ingredient after administration to the patient by employing procedures known in the art.

The compositions are preferably formulated in a unit dosage form, each dosage containing from about 5 to about 100 mg, more usually about 10 to about 30 mg, of the active ingredient. The term “unit dosage forms” refers to physically discrete units suitable as unitary dosages for human subjects and other mammals, each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect, in association with a suitable pharmaceutical excipient.

The active compound is effective over a wide dosage range and is generally administered in a pharmaceutically effective amount. It, will be understood, however, that the amount of the compound actually administered will be determined by a physician, in the light of the relevant circumstances, including the condition to be treated, the chosen route of administration, the actual compound, administered, the age, weight, and response of the individual patient, the severity of the patient's symptoms, and the like.

For preparing solid compositions such as tablets, the principal active ingredient is mixed with a pharmaceutical excipient to form a solid preformulation composition containing a homogeneous mixture of a compound of the present invention. When referring to these preformulation compositions as homogeneous, it is meant that the active ingredient is dispersed evenly throughout the composition so that the composition may be readily subdivided into equally effective unit dosage forms such as tablets, pills and capsules. This solid preformulation is then subdivided into unit dosage forms of the type described above containing from, for example, 0.1 to about 500 mg of the active ingredient of the present invention.

The tablets or pills of the present invention may be coated or otherwise compounded to provide a dosage form affording the advantage of prolonged action. For example, the tablet or pill can comprise an inner dosage and an outer dosage component, the latter being in the form of an envelope over the former. The two components can separated by an enteric layer which serves to resist disintegration in the stomach and permit the inner component to pass intact into the duodenum or to be delayed in release. A variety of materials can be used for such enteric layers or coatings, such materials including a number of polymeric acids and mixtures of polymeric acids with such materials as shellac, cetyl alcohol, and cellulose acetate.

The liquid forms in which the novel compositions of the present invention may be incorporated for administration orally or by injection include aqueous solutions suitably flavored syrups, aqueous or oil suspensions, and flavored emulsions with edible oils such as cottonseed oil, sesame oil, coconut oil, or peanut oil, as well as elixirs and similar pharmaceutical vehicles.

Compositions for inhalation or insufflation include solutions and suspensions in pharmaceutically acceptable, aqueous or organic solvents, or mixtures thereof, and powders. The liquid or solid compositions may contain suitable pharmaceutically acceptable excipients as described supra. Preferably the compositions are administered by the oral or nasal respiratory route for local or systemic effect. Compositions in preferably pharmaceutically acceptable solvents may be nebulized by use of inert gases. Nebulized solutions may be breathed directly from the nebulizing device or the nebulizing device may be attached to a face masks tent, or intermittent positive pressure breathing machine. Solution, suspension, or powder compositions may be administered, preferably orally or nasally, from devices which deliver the formulation in an appropriate manner.

The following formulation examples illustrate the pharmaceutical compositions of the present invention.

FORMULATION EXAMPLE 1

Hard gelatin capsules containing the following ingredients are prepared:

Quantity Ingredient (mg/capsule) Active Ingredient 30.0 Starch 305.0 Magnesium stearate 5.0

The above ingredients are mixed and filled into hard gelatin capsules in 340 mg quantities.

FORMULATION EXAMPLE 2

A tablet formula is prepared using the ingredients below:

Quantity Ingredient (mg/tablet) Active Ingredient 25.0 Cellulose, microcrystalline 200.0 Colloidal silicon dioxide 10.0 Stearic acid 5.0

The components are blended and compressed to form tablets, each weighing 240 mg.

FORMULATION EXAMPLE 3

A dry powder inhaler formulation is prepared containing the following components:

Ingredient Weight % Active Ingredient  5 Lactose 95

The active mixture is mixed with the lactose and the mixture is added to a dry powder inhaling appliance.

FORMULATION EXAMPLE 4

Tablets, each containing 30 mg of active ingredient, are prepared as follows:

Quantity Ingredient (mg/tablet) Active Ingredient 30.0 mg Starch 45.0 mg Microcrystalline cellulose 35.0 mg Polyvinylpyrrolidone 4.0 mg (as 10% solution in water) Sodium carboxymethyl starch 4.5 mg Magnesium stearate 0.5 mg Talc 1.0 mg Total 120 mg

The active ingredient, starch and cellulose are passed through a No. 20 mesh U.S. sieve and mixed thoroughly. The solution of polyvinylpyrrolidone is mixed with the resultant powders, which are then passed through a 16 mesh U.S. sieve. The granules so produced are dried at 50° to 60° C. and passed through a 16 mesh U.S. sieve. The sodium carboxymethyl starch, magnesium stearate, and talc, previously passed through a No. 30 mesh U.S. sieve, are then added to the granules which, after mixing, are compressed on a tablet machine to yield tablets each weighing 150 mg.

FORMULATION EXAMPLE 5

Capsules, each containing 40 mg of medicament are made as follows:

Quantity Ingredient (mg/capsule) Active Ingredient 40.0 mg Starch 109.0 mg Magnesium stearate 1.0 mg Total 150.0 mg

The active ingredient, cellulose, starch, an magnesium stearate are blended, passed through a No. 20 mesh U.S. sieve, and filled into hard gelatin capsules in 150 mg quantities.

FORMULATION EXAMPLE 6

Suppositories, each containing 25 mg of active ingredient are made as follows:

Ingredient Amount Active Ingredient 25 mg Saturated fatty acid glycerides to 2,000 mg

The active ingredient is passed through a No. 60 mesh U.S. sieve and suspended in the saturated fatty acid glycerides previously melted using the minimum heat necessary. The mixture is then poured into a suppository mold of nominal 2.0 g capacity and allowed to cool.

FORMULATION EXAMPLE 7

Suspensions, each containing 50 mg of medicament per 5.0 ml dose are made as follows:

Ingredient Amount Active Ingredient 50.0 mg Xanthan gum 4.0 mg Sodium carboxymethyl 50.0 mg cellulose (11%) Microcrystalline cellulose (89%) Sucrose 1.75 g Sodium benzoate 10.0 mg Flavor and Color q.v. Purified water to 5.0 ml

The medicament, sucrose and xanthan gum are blended, passed through a No. 10 mesh U.S. sieve, and then mixed with a previously made solution of the microcrystalline cellulose and sodium carboxymethyl cellulose in water. The sodium benzoate, flavor, and color are diluted with some of the water and added with stirring. Sufficient water is then added to produce the required volume.

FORMULATION EXAMPLE 8

Quantity Ingredient (mg/capsule) Active Ingredient 15.0 mg Starch 407.0 mg Magnesium stearate 3.0 mg Total 425.0 mg

The active ingredient, cellulose, starch, and magnesium stearate are blended, passed through a No. 20 mesh U.S. sieve, and filled into hard gelatin capsules in 560 mg quantities.

FORMULATION EXAMPLE 9

An intravenous formulation may be prepared as follows:

Ingredient Quantity Active Ingredient 250.0 mg Isotonic saline 1000 mL

FORMULATION EXAMPLE 10

A topical formulation may be prepared as follows:

Ingredient Quantity Active Ingredient   1-10 g Emulsifying Wax    30 g Liquid Paraffin    20 g White Soft Paraffin to 100 g

The white soft paraffin is heated until molten. The liquid paraffin and emulsifying wax are incorporated and stirred until dissolved. The active ingredient is added and stirring is continued until dispersed. The mixture is then cooled until solid.

Another preferred formulation employed in the methods of the present invention employs transdermal delivery devices (“patches”). Such transdermal patches may be used to provide continuous or discontinuous infusion of the compounds of the present invention in controlled amounts. The construction and use of transdermal patches for the delivery of pharmaceutical agents is well known in the art. See, e.g., U.S. Pat. No. 5,023,252, issued Jun. 11, 1991, which is incorporated herein by reference in its entirety. Such patches may be constructed for continuous, pulsatile, or on demand delivery of pharmaceutical agents.

When it is desirable or necessary to introduce the pharmaceutical composition to the brain, either direct or indirect techniques may be employed. Direct techniques usually involve placement of a drug delivery catheter into the host's ventricular system to bypass the blood-brain barrier. One such implantable delivery system used for the transport of biological factors to specific anatomical regions of the body is described in U.S. Pat. No. 5,011,472 which is incorporated herein by reference in its entirety.

Indirect techniques, which are generally preferred, usually involve formulating the compositions to provide for drug latentiation by the conversion of hydrophilic drugs into lipid-soluble drugs. Latentiation is generally achieved through blocking of the hydroxy, carbonyl, sulfate, and primary amine groups present on the drug to render the drug more lipid soluble and amenable to transportation across the blood-brain barrier. Alternatively, the delivery of hydrophilic drugs may be enhanced by intra-arterial infusion of hypertonic solutions which can transiently open the blood-brain barrier.

Utility

The compounds of this invention can be employed to bind VLA-4 (α₄β₁ integrin) in biological samples and, accordingly have utility in, for example, assaying such samples for VLA-4. In such assays, the compounds can be bound to a solid support and the VLA-4 sample added thereto. The amount of VLA-4 in the sample can be determined by conventional methods such as use of a sandwich ELISA assay. Alternatively, labeled VLA-4 can be used in a competitive assay to measure for the presence of VLA-4 in the sample. Other suitable assays are well known in the art.

In addition, certain of the compounds of this invention inhibit, in vivo, adhesion of leukocytes to endothelial cells mediated by VLA-4 and, accordingly, can be used in the treatment of diseases mediated by VLA-4. Such diseases include inflammatory diseases in mammalian patients such as asthma, Alzheimer's disease, atherosclerosis, AIDS dementia, diabetes (including acute juvenile onset diabetes), inflammatory bowel disease (including ulcerative colitis and Crohn's disease), multiple sclerosis, rheumatoid arthritis, tissue transplantation, tumor metastasis, meningitis, encephalitis, stroke, and other cerebral traumas, nephritis, retinitis, atopic dermatitis, psoriasis, myocardial ischemia and acute leukocyte-mediated lung injury such as that which occurs in adult respiratory distress syndrome.

The biological activity of the compounds identified above may be assayed in a variety of systems. For example, a compound can be immobilized on a solid surface and adhesion of cells expressing VLA-4 can be measured. Using such formats, large numbers of compounds can be screened. Cells suitable for this assay include any leukocytes known to express VLA-4 such as T cells, B cells, monocytes, eosinophils, and basophils. A number of leukocyte cell lines can also be used, examples include Jurkat and U937.

The test compounds can also be tested for the ability to competitively inhibit binding between VLA-4 and VCAM-1, or between VLA-4 and a labeled compound known to bind VLA-4 such as a compound of this invention or antibodies to VLA-4. In these assays, the VCAM-1 can be immobilized on a solid surface. VCAM-1 may also be expressed as a recombinant fusion protein having an Ig tail (e.g., IgG₁) so that binding to VLA-4 may be detected in an immunoassay. Alternatively, VCAM-1 expressing cells, such as activated endothelial cells or VCAM-1 transfected fibroblasts can be used. For assays to measure the ability to block adhesion to brain endothelial cells, the assays described in International Patent Application Publication No. WO 91/05038 are particularly preferred. This application is incorporated herein by reference in its entirety.

Many assay formats employ labelled assay components. The labelling systems can be in a variety of forms. The label may be coupled directly or indirectly to the desired component of the assay according to methods well known in the art. A wide variety of labels may be used. The component may be labelled by any one of several methods. The most common method of detection is the use of autoradiography with ³H, ¹²⁵I, ³⁵S, ¹⁴C, or ³²P labelled compounds and the like. Non-radioactive labels include ligands which bind to labelled antibodies, fluorophores, chemiluminescent agents, enzymes and antibodies which can serve as specific binding pair members for a labelled ligand. The choice of label depends on sensitivity required, ease of conjugation with the compound, stability requirements, and available instrumentation.

Appropriate in vivo models for demonstrating efficacy in treating inflammatory responses include EAE (experimental autoimmune encephalomyelitis) in mice, rats, guinea pigs or primates, as well as other inflammatory models dependent upon α4 integrins.

Compounds having the desired biological activity may be modified as necessary to provide desired properties such as improved pharmacological properties (e.g., in vivo stability, bio-availability), or the ability to be detected in diagnostic applications. For instance, inclusion of one or more D-amino acids in the sulfonamides of this invention typically increases in vivo stability. Stability can be assayed in a variety of ways such as by measuring the half-life of the proteins during incubation with peptidases or human plasma or serum. A number of such protein stability assays have been described (see, e.g., Verhoef, et al., Eur. J. Drug Metab. Pharmacokinet., 1990, 15(2):83-93).

For diagnostic purposes, a wide variety of labels may be linked to the compounds, which may provide, directly or indirectly, a detectable signal. Thus, the compounds of the subject invention may be modified in a variety of ways for a variety of end purposes while still retaining biological activity. In addition, various reactive sites may be introduced at the terminus for linking to particles, solid substrates, macromolecules, and the like.

Labeled compounds can be used in a variety of in vivo or in vitro applications. A wide variety of labels may be employed, such as radionuclides (e.g., gamma-emitting radioisotopes such as technetium-99 or indium-111), fluorescers (e.g., fluorescein), enzymes, enzyme substrates, enzyme cofactors, enzyme inhibitors, chemiluminescent compounds, bioluminescent compounds, and the like. Those of ordinary skill in the art will know of other suitable labels for binding to the complexes, or will be able to ascertain such using routine experimentation. The binding of these labels is achieved using standard techniques common to those of ordinary skill in the art.

In vitro uses include diagnostic applications such as monitoring inflammatory responses by detecting the presence of leukocytes expressing VLA-4. The compounds of this invention can also be used for isolating or labeling such cells. In addition, as mentioned above, the compounds of the invention can be used to assay for potential inhibitors of VLA-4/VCAM-1 interactions.

For in vivo diagnostic imaging to identify, e.g., sites of inflammation, radioisotopes are typically used in accordance with well known techniques. The radioisotopes may be bound to the peptide either directly or indirectly using intermediate functional groups. For instance, chelating agents such as diethylenetriaminepentacetic acid (DTPA) and ethylenediaminetetraacetic acid (EDTA) and similar molecules have been used to bind proteins to metallic ion radioisotopes.

The complexes can also be labeled with a paramagnetic isotope for purposes of in vivo diagnosis, as in magnetic resonance imaging (MRI) or electron spin resonance (ESR), both of which are well known. In general, any conventional method for visualizing diagnostic images can be used. Usually gamma- and positron-emitting radioisotopes are used for camera imaging and paramagnetic isotopes are used for MRI. Thus, the compounds can be used to monitor the course of amelioration of an inflammatory response in an individual. By measuring the increase or decrease in lymphocytes expressing VLA-4 it is possible to determine whether a particular therapeutic regimen aimed at ameliorating the disease is effective.

The pharmaceutical compositions of the present invention can be used to block or inhibit cellular adhesion associated with a number of diseases and disorders. For instance, a number of inflammatory disorders are associated with integrins or leukocytes. Treatable disorders include, e.g., transplantation rejection (e.g., allograft rejection), Alzheimer's disease, atherosclerosis, AIDS dementia, diabetes (including acute juvenile onset diabetes), retinitis, cancer metastases, rheumatoid arthritis, acute leukocyte-mediated lung injury (e.g., adult respiratory distress syndrome), asthma, nephritis, and acute and chronic inflammation, including atopic dermatitis, psoriasis, myocardial ischemia, and inflammatory bowel disease (including Crohn's disease and ulcerative colitis). In preferred embodiments, the pharmaceutical compositions are used to treat inflammatory brain disorders, such as Alzheimer's disease, AIDS dementia, multiple sclerosis (MS), viral meningitis and encephalitis.

Inflammatory bowel disease is a collective term for two similar diseases referred to as Crohn's disease and ulcerative colitis. Crohn's disease is an idiopathic, chronic ulceroconstrictive inflammatory disease characterized by sharply delimited and typically transmural involvement of all layers of the bowel wall by a granulomatous inflammatory reaction. Any segment of the gastrointestinal tract, from the mouth to the anus, may be involved, although the disease most commonly affects the terminal ileum and/or colon. Ulcerative colitis is an inflammatory response limited largely to the colonic mucosa and submucosa. Lymphocytes and macrophages are numerous in lesions of inflammatory bowel disease and may contribute to inflammatory injury.

Asthma is a disease characterized by increased responsiveness of the tracheobronchial tree to various stimuli potentiating paroxysmal constriction of the bronchial airways. The stimuli cause release of various mediators of inflammation from IgE-coated mast cells including histamine, eosinophilic and neutrophilic chemotactic factors, leukotrines, prostaglandin and platelet activating factor. Release of these factors recruits basophils, eosinophils and neutrophils, which cause inflammatory injury.

Atherosclerosis is a disease of arteries (e.g., coronary, carotid, aorta and iliac). The basic lesion, the atheroma, consists of a raised focal plaque within the intima, having a core of lipid and a covering fibrous cap. Atheromas compromise arterial blood flow and weaken affected arteries. Myocardial and cerebral infarcts are a major consequence of this disease. Macrophages and leukocytes are recruited to atheromas and contribute to inflammatory injury.

Rheumatoid arthritis is a chronic, relapsing inflammatory disease that primarily causes impairment and destruction of joints. Rheumatoid arthritis usually first affects the small joints of the hands and feet but then may involve the wrists, elbows, ankles and knees. The arthritis results from interaction of synovial cells with leukocytes that infiltrate from the circulation into the synovial lining of the joints. See e.g., Paul, Immunology (3d ed., Raven Press, 1993).

Another indication for the compounds of this invention is in treatment of organ or graft rejection mediated by VLA-4. Over recent years there has been a considerable improvement in the efficiency of surgical techniques for transplanting tissues and organs such as skin, kidney, liver, heart, lung, pancreas and bone marrow. Perhaps the principal outstanding problem is the lack of satisfactory agents for inducing immunotolerance in the recipient to the transplanted allograft or organ. When allogeneic cells or organs are transplanted into a host (i.e., the donor and donee are different individuals from the same species), the host immune system is likely to mount an immune-response to foreign antigens in the transplant (host-versus-graft disease) leading to destruction of the transplanted tissue. CD8⁺ cells, CD4 cells and monocytes are all involved in the rejection of transplant tissues. Compounds of this invention which bind to alpha-4 integrin are useful, inter alia, to block alloantigen-induced immune responses in the donee thereby preventing such cells from participating in the destruction of the transplanted tissue or organ. See, e.g., Paul et al., Transplant International 9, 420-425 (1996); Georczynski et al., Immunology 87, 573-580 (1996); Georcyznski et al., Transplant. Immunol. 3, 55-61 (1995); Yang et al., Transplantation 60, 71-76 (1995); Anderson et al., APMIS 102, 23-27 (1994).

A related use for compounds of this invention which bind to VLA-4 is in modulating the immune response involved in “graft versus host” disease (GVHD). See e.g., Schlegel et al., J. Immunol. 155, 3856-3865 (1995). GVHD is a potentially fatal disease that occurs when immunologically competent cells are transferred to an allogeneic recipient. In this situation, the donor's immunocompetent cells may attack tissues in the recipient. Tissues of the skin, gut epithelia and liver are frequent targets and may be destroyed during the course of GVHD. The disease presents an especially severe problem when immune tissue is being transplanted, such as in bone marrow transplantation; but less severe GVHD has also been reported in other cases as well, including heart and liver transplants. The therapeutic agents of the present invention are used, inter alia, to block activation of the donor T-cells thereby interfering with their ability to lyse target cells in the host.

A further use of the compounds of this invention is inhibiting tumor metastasis. Several tumor cells have been reported to express VLA-4 and compounds which bind VLA-4 block adhesion of such cells to endothelial cells. Steinback et al., Urol. Res. 23, 175-83 (1995); Orosz et al., Int. J. Cancer 60,-867-71 (1995); Freedman et al., Leuk. Lymphoma 13, 47-52 (1994); Okahara et al., Cancer Res. 54, 3233-6 (1994).

A further use of the compounds of this invention is in treating multiple sclerosis. Multiple sclerosis is a progressive neurological autoimmune disease that affects an estimated 250,000 to 350,000 people in the United States. Multiple sclerosis is thought to be the result of a specific autoimmune reaction in which certain leukocytes attack and initiate the destruction of myelin, the insulating sheath covering nerve fibers. In an animal model for multiple sclerosis, murine monoclonal antibodies directed against VLA-4 have been shown to block the adhesion of leukocytes to the endothelium, and thus prevent inflammation of the central nervous system and subsequent paralysis in the animals.¹⁶

Pharmaceutical compositions of the invention are suitable for use in a variety of drug delivery systems. Suitable formulations for use in the present invention are found in Remington's Pharmaceutical Sciences, Mace Publishing Company, Philadelphia, Pa., 17th ed. (1985).

In order to enhance serum half-life, the compounds may be encapsulated, introduced into the lumen of liposomes, prepared as a colloid, or other conventional techniques may be employed which provide an extended serum half-life of the compounds. A variety of methods are available for preparing liposomes, as described in, e.g., Szoka, et al., U.S. Pat. Nos. 4,235,871, 4,501,728 and 4,837,028 each of which is incorporated herein by reference.

The amount administered to the patient will vary depending upon what is being administered, the purpose of the administration, such as prophylaxis or therapy, the state of the patient, the manner of administration, and the like. In therapeutic applications, compositions are administered to a patient already suffering from a disease in an amount sufficient to cure or at least partially arrest the symptoms of the disease and its complications. An amount adequate to accomplish this is defined as “therapeutically effective dose.” Amounts effective for this use will depend on the disease condition being treated as well as by the judgment of the attending clinician depending upon factors such as the severity of the inflammation, the age, weight and general condition of the patient, and the like.

The compositions administered to a patient are in the form of pharmaceutical compositions described above. These compositions may be sterilized by conventional sterilization techniques, or may be sterile filtered. The resulting aqueous solutions may be packaged for use as is, or lyophilized, the lyophilized preparation being combined with a sterile aqueous carrier prior to administration. The pH of the compound preparations typically will be between 3 and 11, more preferably from 5 to 9 and most preferably from 7 to 8. It will be understood that use of certain of the foregoing excipients, carriers, or stabilizers will result in the formation of pharmaceutical salts.

The therapeutic dosage of the compounds of the present invention will vary according to, for example, the particular use for which the treatment is made, the manner of administration of the compound, the health and condition of the patient, and the judgment of the prescribing physician. For example, for intravenous administration, the dose will typically be in the range of about 20 μg to about 500 μg per kilogram body weight, preferably about 100 μg to about 300 μg per kilogram body weight. Suitable dosage ranges for intranasal administration are generally about 0.1 pg to 1 mg per kilogram body weight. Effective doses can be extrapolated from dose-response curves derived from in vitro or animal model test systems.

The following synthetic and biological examples are offered to illustrate this invention and are not to be construed in any way as limiting the scope of this invention. Unless otherwise stated, all temperatures are in degrees Celsius.

EXAMPLES

In the examples below, the following abbreviations have the following meanings. If an abbreviation is not defined, it has its generally accepted meaning.

aq or aq. = aqueous AcOH = acetic acid bd = broad doublet bm = broad multiplet bs = broad singlet Bn = benzyl Boc = tert-butoxycarbonyl Boc₂O = di-tert-butyl dicarbonate BOP = benzotriazol-1-yloxy- tris(dimethylamino)phosphonium hexafluorophosphate Cbz = carbobenzyloxy CHCl₃ = chloroform CH₂Cl₂ = dichloromethane (COCl)₂ = oxalyl chloride d = doublet dd = doublet of doublets dt = doublet of triplets DBU = 1,8-diazabicyclo[5.4.0]undec-7-ene DCC = 1,3-dicyclohexylcarbodiimide DMAP = 4-N,N-dimethylaminopyridine DME = ethylene glycol dimethyl ether DMF = N,N-dimethylformamide DMSO = dimethylsulfoxide EDC = 1-(3-dimethylaminopropyl)-3- ethylcarbodiimide hydrochloride Et₃N = triethylamine Et₂O = diethyl ether EtOAc = ethyl acetate EtOH = ethanol eq or eq. = equivalent Fmoc = N-(9-fluorenylmethoxycarbonyl) FmocONSu = N-(9-fluorenylmethoxycarbonyl)- succinimide g = grams h = hour H₂O = water HBr = hydrobromic acid HCl = hydrochloric acid HOBT = 1-hydroxybenzotriazole hydrate hr = hour K₂CO₃ = potassium carbonate L = liter m = multiplet MeOH = methanol mg = milligram MgSO₄ = magnesium sulfate mL = milliliter mm = millimeter mM = millimolar mmol = millimol mp = melting point N = normal NaCl = sodium chloride Na₂CO₃ = sodium carbonate NaHCO₃ = sodium bicarbonate NaOEt = sodium ethoxide NaOH = sodium hydroxide NH₄Cl = ammonium chloride NMM = N-methylmorpholine Phe = L-phenylalanine Pro = L-proline psi = pounds per square inch PtO₂ = platinum oxide q = quartet quint. = quintet rt = room temperature s = singlet sat = saturated t = triplet t-BuOH = tert-butanol TFA = trifluoroacetic acid THF = tetrahydrofuran TLC or tlc = thin layer chromatography Ts = tosyl TsCl = tosyl chloride TsOH = tosylate μL = microliter

In the examples below, all temperatures are in degrees Celsius (unless otherwise indicated). The following Methods were used to prepare the compounds set forth below as indicated.

Method 1 N-Tosylation Procedure

N-Tosylation of the appropriate amino acid was conducted via the method of Cupps, Boutin and Rapoport J. Org. Chem. 1985, 50, 3972.

Method 2 Methyl Ester Preparation Procedure

Amino acid methyl esters were prepared using the method of Brenner and Huber Helv. Chim. Acta 1953, 36, 1109.

Method 3 BOP Coupling Procedure

The desired dipeptide ester was prepared by the reaction of a suitable N-protected amino acid (1 equivalent) with the appropriate amino acid ester or amino acid ester hydrochloride (1 equivalent), benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphate [BOP] (2.0 equivalent), triethylamine (1.1 equivalent), and DMF. The reaction mixture was stirred at room temperature overnight. The crude product is purified flash chromatography to afford the dipeptide ester.

Method 4 Hydrogenation Procedure I

Hydrogenation was performed using 10% palladium on carbon (10% by weight) in methanol at 30 psi overnight. The mixture was filtered through a pad of Celite and the filtrate concentrated to yield the desired amino compound.

Method 5 Hydrolysis Procedure I

To a chilled (0° C.) THF/H₂O solution (2:1, 5-10 mL) of the appropriate ester was added LiOH (or NaOH) (0.95 equivalents). The temperature was maintained at 0° C. and the reaction was complete in 1-3 hours. The reaction mixture was extracted with ethyl acetate and the aqueous phase was lyophilized resulting in the desired carboxylate salt.

Method 6 Ester Hydrolysis Procedure II

To a chilled (0° C.) THF/H₂O solution (2:1, 5-10 mL) of the appropriate ester was added LiOH (1.1 equivalents). The temperature was maintained at 0° C. and the reaction was complete in 1-3 hours. The reaction mixture was concentrated and the residue was taken up into H₂O and the pH adjusted to 2-3 with aqueous HCl. The product was extracted with ethyl acetate and the combined organic phase was washed with brine, dried over MgSO₄, filtered and concentrated to yield the desired acid.

Method 7 Ester Hydrolysis Procedure III

The appropriate ester was dissolved in dioxane/H₂O (1:1) and 0.9 equivalents of 0.5 N NaOH was added. The reaction was stirred for 3-16 hours and than concentrated. The resulting residue was dissolved in H₂O and extracted with ethyl acetate. The aqueous phase was lyophilized to yield the desired carboxylate sodium salt.

Method 8 Sulfonylation Procedure I

To the appropriately protected aminophenylalanine analog (11.2 mmol), dissolved in methylene chloride (25 ml) and cooled to −78° C. was added the desired sulfonyl chloride (12 mmol) followed by dropwise addition of pyridine (2 mL). The solution was allowed to warm to room temperature and was stirred for 48 hr. The reaction solution was transferred to a 250 mL separatory funnel with methylene chloride (100 mL) and extracted with 1N HCl (50 mL×3), brine (50 mL), and water (100 mL). The organic phase was dried (MgSO4) and the solvent concentrated to yield the desired product.

Method 9 Reductive Amination Procedure

Reductive amination of Tos-Pro-p-NH₂-Phe with the appropriate aldehyde was conducted using acetic acid, sodium triacetoxyborohydride, methylene chloride and the combined mixture was stirred at room temperature overnight. The crude product was purified by flash chromatography.

Method 10 BOC Removal Procedure

Anhydrous hydrochloride (HCl) gas was bubbled through a methanolic solution of the appropriate Boc-amino acid ester at 0° C. for 15 minutes and the reaction mixture was stirred for three hours. The solution was concentrated to a syrup and dissolved in Et₂O and reconcentrated. This procedure was repeated and the resulting solid was placed under high vacuum overnight.

Method 11 tert-Butyl Ester Hydrolysis Procedure I

The tert-butyl ester was dissolved in CH₂Cl₂ and treated with TFA. The reaction was complete in 1-3 hr at which time the reaction mixture was concentrated and the residue dissolved in H₂O and lyophilized to yield the desired acid.

Method 12 EDC Coupling Procedure I

To a CH₂Cl₂ solution (5-20 mL) of N-(toluene-4-sulfonyl)-L-proline (1 equivalent), the appropriate amino acid ester hydrochloride (1 equivalent), N-methylmorpholine (1.1-2.2 equivalents) and 1-hydroxybenzotriazole (2 equivalents) were mixed, placed in an ice bath and 1-(3-dimethylaminopropyl)-3-ethyl carbodiimide (1.1 equivalents) added. The reaction was allowed to rise to room temperature and stirred overnight. The reaction mixture was poured into H₂O and the organic phase was washed with sat. NaHCO₃, brine, dried (MgSO₄ or Na₂SO₄), filtered and concentrated. The crude product was purified by column chromatography.

Method 13 EDC Coupling Procedure II

To a DMF solution (5-20 mL) of the appropriate N-protected amino acid (1 equivalent), the appropriated amino acid ester hydrochloride (1 equivalent), Et₃N (1.1 equivalents) and 1-hydroxybenzotriazole (2 equivalents) were mixed, placed in an ice bath and 1-(3-dimethylaminopropyl)-3-ethyl carbodiimide (1.1 equivalents) added. The reaction was allowed to rise to room temperature and stirred overnight. The reaction mixture was partitioned between EtOAc and H₂O and, the organic phase washed with 0.2 N citric acid, H₂O, sat. NaHCO₃, brine, dried (MgSO₄ or Na₂SO₄), filtered and concentrated. The crude product was purified by column chromatography or preparative TLC.

Method 14 Sulfonylation Procedure II

The appropriate sulfonyl chloride was dissolved in CH₂Cl₂ and placed in an ice bath. L-Pro-L-Phe-OMe.HCl (1 equivalent) and Et₃N (1.1 equivalent) was added and the reaction allowed to warm to room temperature and stirred overnight under an atmosphere of nitrogen. The reaction mixture was concentrated and the residue partitioned between EtOAc and H₂O and the organic phase washed with sat. NaHCO₃, brine, dried (MgSO₄ or Na₂SO₄), filtered and concentrated. The crude product was purified by column chromatography or preparative TLC.

Method 15 Sulfonylation Procedure III

To a solution of L-Pro-L-4-(3-dimethylaminopropyloxy)-Phe-OMe [prepared using the procedure described in Method 10] (1 equivalent) in CH₂Cl₂ was added Et₃N (5 equivalents) followed by the appropriate sulfonyl chloride (1.1 equivalent). The reaction was allowed to warm to room temperature and stirred overnite under an atmosphere of nitrogen. The mixture was concentrated, dissolved in EtOAc, washed with sat. NaHCO₃ and 0.2 N citric acid. The aqueous phase was made basic with solid NaHCO₃ and the product extracted with EtOAc. The organic phase was washed with brine, dried (MgSO₄ or Na₂SO₄), filtered and concentrated. The crude methyl ester was purified by preparative TLC. The corresponding acid was prepared using the procedure described in Method 7.

Method 16 Hydrogenation Procedure II

To a methanol (10-15 mL) solution of the azlactone was added NaOAc (1 equivalent) and 10% Pd/C. This mixture was placed on the hydrogenator at 40 psi H,. After 8-16 hours, the reaction mixture was filtered through a pad of Celite and the filtrate concentrated to yield the dehydrodipeptide methyl ester. The ester was dissolved in dioxane/H₂O (5-10 mL), to which was added 0.5 N NaOH (1.05 equivalents). After stirring for 1-3 hours, the reaction mix was concentrated and the residue was redissolved in H₂O and washed with EtOAc. The aqueous phase was made acidic with 0.2 N HCl and the product was extracted with EtOAc. The combined organic phase was washed with brine (1×5 mL), dried (MgSO₄ or Na₂SO₄), filtered and concentrated to yield the acid as approximately a 1:1 mixture of diastereomers.

Method 17 tert-Butyl Ester Hydrolysis Procedure II

The tert-butyl ester was dissolved in CH₂Cl₂ (5 mL) and treated with TFA (5 mL). The reaction was complete in 1-3 hours at which time the reaction mixture was concentrated and the residue dissolved in H₂O and concentrated. The residue was redissolved in H₂O and lyophilized to yield the desired product.

Example 1 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine Ethyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CD₃)₂SO): δ=8.33 (d, 1H), 7.70 (d, 2H), 7.41 (d, 2H), 7.24 (d, 2H), 7.00 (d, 2H), 4.52-4.44 (m, 1H), 4.09-4.00 (m, 3H), 3.53 (bs, 2H), 3.38-3.31 (m, 3H), 3.11-3.01 (m, 3H), 2.39 (s, 3H), 2.32 (bs, 4H), 2.19 (s, 3H), 1.61-1.50 (m, 3H), 1.43-1.38 (m, 1H), 1.13 (t, 3H).

¹³C NMR (CD₃)₂SO): δ=171.1, 171.1, 153.9, 149.8, 143.6, 134.1, 133.9, 130.0, 129.8, 127.4, 121.5, 61.2, 60.7, 54.2, 54.1, 53.3, 49.0, 45.7, 44.0, 43.4, 35.8, 30.5, 23.8, 21.0, 14.0.

Example 2 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Ethyl Ester

Into a reaction vial were combined 7.00 g (15.2 mmol, 1.0 eq) Ts-Pro-Tyr(H)-OEt and 1.86 g (15.2 mmol, 1.0 eq) DMAP. Methylene chloride (50 mL), triethylamine (2.12 mL—1.54 g, 15.2 mmol, 1.0 eq), and dimethylcarbamyl chloride (1.68 mL—1.96 g, 18.2 mmol, 1.2 eq) were then added. The vial was capped tightly, and the reaction solution swirled to obtain a homogeneous solution. The reaction solution was then heated to 40° C. After 48 h, TLC of the resulting colorless solution indicated complete conversion. The workup of the reaction solution was as follows: add 50 mL EtOAc and 50 mL hexanes to the reaction mixture, and wash with 3×50 mL 0.5 mL hexanes to the reaction mixture, and wash with 3×50 mL 0.5 M citric acid, 2×50 mL water, 2×50 mL 10% K₂CO₃, and 1×50 mL sat. NaCl. Dry with MgSO₄. Filter. Evaporate to obtain 8.00 g (99%) of the title compound as a clear oil, which solidifies upon standing. Recrystallize from 5:3:2 heptane/EtOAc/CH₂Cl₂.

NMR data was as follows:

¹H NMR (CD₃)₂SO): δ=8.32 (d, 1H), 7.70 (d, 2H), 7.41 (d, 2H), 7.23 (d, 2H), 7.00 (d, 2H), 4.52-4.44 (m, 1H), 4.09-4.02 (m, 3H), 3.37-3.31 (m, 1H), 3.11-2.96 (m, 3H), 3.00 (s, 3H), 2.87 (s, 3H), 2.39 (s, 3H), 1.61-1.50 (m, 3H), 1.43-1.38 (m, 1H), 1.13 (t, 3H).

¹³C NMR (CD₃)₂SO): δ=171.1, 171.1, 154.0, 150.0, 143.6, 133.9, 133.9, 130.0, 129.8, 127.4, 121.5, 61.2, 60.6, 53.3, 49.0, 36.3, 36.1, 35.8, 30.5, 23.8, 21.0, 14.0.

Example 3 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.72 (d, 2H), 7.36 (d, 1H), 7.33 (d, 2H), 7.16 (d, 2H), 7.03 (d, 2H), 5.07 (Sept., 1H), 4.78 (dt, 1H), 4.08-4.05 (m, 1H), 3.67 (bs, 2H), 3.57 (bs, 2H), 3.41-3.35 (m, 1H), 3.24 (dd, 1H), 3.15-3.07 (m, 1H), 3.04 (dd, 1H), 3.46-2.43 (m, 7H), 2.34 (s, 3H), 2.05-2.02 (m, 1H).

¹³C NMR (CDCl₃): δ=170.9, 170.4, 153.6, 150.5, 144.3, 133.2, 133.1, 130.2, 130.0, 127.9, 121.7, 69.5, 62.2, 54.7, 53.4, 49.6, 46.1, 44.3, 43.7, 37.2, 29.7, 24.1, 21.6, 21.6, 21.4.

Example 4 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

Combine 41.2 g (84.34 mmol, 1.0 eq) Ts-Pro-Tyr(H)-OtBu and 17.0 g (84.34 mmol, 1.0 eq) 4-nitrophenyl chloroformate. Add 700 mL CH₂Cl₂. Cap with a septum. Attach a N₂ line. Immerse the flask in a 4:1 water/EtOH+dry ice slurry, and stir to cool to −15° C. Add 29.38 mL (21.33 g, 210.81 mmol, 2.5 eq) Et₃N over five minutes with stirring. Stir at −10 to −15° C. for 1 h. Add 9.35 mL (8.45 g, 84.34 mmol, 1.0 eq) N-methyl piperazine over 3 minutes with stirring. Stir overnight while warming to room temperature. Dilute with 700 mL hexanes. Wash repeatedly with 10% K₂CO₃, until no yellow color (4-nitrophenol) is seen in the aqueous layer. Wash with sat. NaCl. Dry over anhydrous MgSO₄. Filter. Evaporate. Dissolve in 500 mL EtOH, and evaporate, to remove Et₃N. Repeat once. Dissolve in 400 mL EtOH, and add 600 mL water with stirring, to precipitate a solid or oil. If an oil, stir vigorously to solidify. Isolate the solid by filtration. Repeat dissolution, precipitation, and filtration, once. Rinse with water to remove traces of yellow color. High vacuum to constant mass yields the title compound as a white solid.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.72 (d, 2H), 7.33 (d, 3H), 7.17 (d, 2H), 7.02 (d, 2H), 4.71 (q, 1H), 4.09-4.06 (m, 1H), 3.67 (bs, 2H), 3.57 (bs, 2H), 3.41-3.34 (m, 1H), 3.22 (dd, 1H), 3.16-3.09 (m, 1H), 3.03 (dd, 1H), 2.46-2.43 (m, 7H), 2.34 (s, 3H), 2.05-2.02 (m, 1H), 1.57-1.43 (m, 3H), 1.47 (s, 9H).

¹³C NMR (CDCl₃): δ=171.8, 169.9, 153.6, 150.4, 144.3, 133.4, 133.1, 130.3, 130.0, 127.9, 121.6, 82.6, 62.3, 54.5, 53.8, 49.6, 46.1, 44.3, 43.7, 37.3, 29.7, 27.8, 24.1, 21.4.

Example 5 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 1 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CD₃OD): δ=7.74 (d, 2H), 7.42 (d, 2H), 7.26 (d, 2H), 7.04 (d, 2H), 4.58-4.54 (m, 1H), 4.16-4.12 (m, 1H), 3.70 (bs, 2H) 3.53 (bs, 2H), 3.43-3.31 (m, 1H), 3.26-3.13 (m, 7H), 2.82 (s, 3H), 2.43 (s, 3H), 1.98-1.94 (m, 1H), 1.76-1.51 (m, 3H).

¹³C NMR (CD₃OD): δ=175.7, 173.6, 154.8, 151.6, 146.1, 136.3, 134.8, 131.9, 131.3, 129.1, 122.7, 63.6, 55.9, 53.9, 50.7, 43.5, 37.6, 31.3, 25.5, 21.5.

Example 6 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine n-Butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CD₃)₂SO: δ=8.31 (d, 1H), 7.70 (d, 2H), 7.41 (d, 2H), 7.23 (d, 2H), 6.99 (d, 2H), 4.53-4.46 (m, 1H), 4.10-4.01 (m, 1H), 3.63-3.30 (m, 1H), 3.10-2.96 (m, 3H), 3.00 (s, 3H), 2.88 (s, 3H), 2.39 (s, 3H), 1.59-1.30 (m, 6H), 1.33-1.20 (m, 2H), 0.85 (t, 3H).

¹³C NMR (CD₃)₂SO: δ=171.4, 171.3, 154.2, 150.2, 143.7, 134.0, 130.1, 130.0, 127.6, 121.7, 64.3, 61.2, 59.2, 53.4, 49.0, 36.2, 36.0, 35.8, 30.0, 23.8, 21.0, 18.5, 13.5.

Example 7 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Cyclopentyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CD₃)₂SO: δ=8.27 (d, 1H), 7.70 (d, 2H), 7.41 (d, 2H), 7.22 (d, 2H), 6.99 (d, 2H), 5.04 (bs, 1H), 4.48-4.40 (m, 1H), 4.08-4.05 (m, 1H), 3.34-3.30 (m, 1H), 3.09-2.95 (m, 3H), 3.00 (s, 3H), 2.88 (s, 3H), 2.39 (s, 3H), 1.76-1.74 (m, 2H), 1.57-1.40 (m, 10H).

¹³C NMR (CD₃)₂SO: δ=171.3, 171.0, 154.2, 150.2, 432.7, 134.1, 130.1, 130.0, 127.6, 121.6, 77.4, 61.2, 53.4, 49.0, 36.2, 36.1, 35.7, 32.0, 30.5, 23.8, 23.2, 21.0.

Example 8 Synthesis of N-Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CD₃)₂SO: δ=8.18 (d, 1H), 7.71 (d, 2H), 7.41 (d, 2H), 7.23 (d, 2H), 6.99 (d, 2H), 4.42-4.38 (m, 1H), 4.10-4.07 (m, 1H), 3.37-3.30 (m, 1H), 3.09-2.95 (m, 3H), 3.00 (s, 3H), 2.88 (s, 3H), 2.39 (s, 3H), 1.58-1.50 (m, 3H), 1.40-1.30 (m, 1H), 1.36 (s, 9H).

¹³C NMR (CD₃)₂SO: δ=171.1, 170.3, 154.2, 150.2, 143.8, 134.2, 134.1, 130.2, 130.0, 127.6, 121.6, 81.0, 61.3, 53.8, 49.0, 36.3, 36.0, 35.9, 30.5, 27.5, 23.8, 21.0.

Example 9 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The tide compound was prepared from the product of Example 2 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CD₃)₂SO: δ=8.13 (d, 1H), 7.70 (d, 2H), 7.41 (d, 2H), 7.23 (d, 2H), 6.99 (d, 2H), 4.51-4.44 (m, 1H), 4.11-4.09 (m, 1H), 3.40-3.34 (m, 2H), 3.11-2.94 (m, 3H), 3.00 (s, 3H), 2.87 (s, 3H), 2.39 (s, 3H), 1.59-1.36 (m, 4H).

¹³C NMR (CD₃)₂SO: δ=172.7, 171.2, 153.6, 150.2, 143.8, 134.3, 134.0, 130.2, 130.0, 127.6, 121.6, 61.3, 53.2, 49.0, 36.3, 36.1, 35.9, 30.4, 23.8, 21.0.

Example 10 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-3-(N,N-dimethylcarbamyloxy)phenylalanine Ethyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.74 (m, 2H), 7.70-7.36 (m, 4H), 7.24-7.14 (m, 3H), 6.93-4.90 (m, 1H), 4.78-4.27 (m, 3H), 4.05-3.55 (m, 0.5H), 3.48-3.43 (m, 0.5H), 3.37-3.30 (m, 3H), 3.02-3.08 (bs, 3H), 2.99 (bs, 3H), 2.45 (s, 1.5H), 2.43 (s, 1.5H), 2.12 (m, 1H), 198, 1.80 (m, 0.5M), 1.62-1.44 (m, 2.5H), 1.29 (t, 1.5H), 1.24 (t, 1.5H).

¹³C NMR (CDCl₃): δ=171.1, 171.0, 170.9, 154.9, 154.8, 151.8, 151.6, 144.4, 144.3, 137.6, 137.1, 133.1, 132.9, 130.0, 129.9, 129.5, 129.2, 127.9, 127.9, 126.5, 126.1, 122.9, 122.7, 120.7, 120.5.

Example 11 Synthesis of N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.76 (d, 2H), 7.35 (d, 2H), 7.22 (d, 2H), 7.01 (m, 3H), 5.05 (m, 1H), 4.85 (m, 1H), 4.57 (d, 1H), 4.38 (d, 1H), 3.86 (s, 1H), 3.19-3.00 (m, 2H), 3.09 (s, 3H), 3.01 (s, 3H), 2.45 (s, 3H), 1.24 (t, 6H), 1.16 (s, 3H), 1.09 (s, 3H).

¹³C NMR (CDCl₃): δ=170.3, 168.4, 154.9, 150.6, 144.8, 132.9, 132.8, 130.3, 130.0, 128.2, 121.7, 73.4, 69.5, 54.5, 53.2, 50.4, 37.7, 36.5, 36.3, 29.0, 23.8, 21.5, 21.4.

Example 12 Synthesis of N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.75 (d, 2H), 7.34 (d, 2H), 7.23 (d, 2H), 7.05-6.98 (m, 3H), 4.76 (m, 1H), 4.56 (d, 1H), 4.40 (d, 1H), 3.85 (s, 1H), 3.09-3.00 (m, 8H), 2.44 (s, 3H), 1.43 (s, 3H), 1.16 (s, 3H), 1.09 (s, 3H).

¹³C NMR (CDCl₃): δ=169.8, 168.3, 154.9, 150.6, 144.8, 133.2, 132.9, 130.4, 130.0, 128.2, 121.6, 82.6, 73.4, 54.6, 53.8, 50.4, 37.8, 36.5, 36.3, 29.0, 27.7, 23.8, 21.5.

Example 13 Synthesis of N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 11 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.76 (d, 2H), 7.35 (d, 2H), 7.25 (d, 2H), 7.14 (d, 1H), 7.02 (d, 2H), 5.17 (br s, 1H), 4.89 (m, 1H), 4.56 (d, 1H), 4.40 (d, 1H), 3.90 (s, 1H), 3.30-3.00 (m, 8H), 2.43 (s, 3H), 1.09 (s, 6H).

¹³C NMR (CDCl₃): δ=172.7, 169.3, 155.2, 150.6, 144.9, 133.1, 132.7, 130.5, 130.1, 128.1, 121.9, 73.3, 54.5, 53.3, 50.5, 36.9, 36.6, 36.4, 29.0, 23.7, 21.5.

Example 14 Synthesis of N-(Toluene-4-sulfonyl)-L-[(1,1-dioxo)thiamorpholin-3-carbonyl]-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

L-Thiamorpholine-5-carboxylic acid was prepared by the method of Larsson and Carlson (Acta Chemica Scan. 1994, 48, 517-525). N-(Toluene-4-sulfonyl)-L-thiamorpholine-5-carboxylic acid was prepared using the procedure described in Method 1 and was then coupled to t-butyl tyrosine in DMF in the presence of BOP and NMM, to give after aqueous workup and flash chromatography N-(Toluene-4-sulfonyl)-L-[thiamorpholin-3-carbonyl]-L-4-phenylalanine tert-butyl ester.

Formation of the 4-(N,N-dimethylcarbamyloxy) group was per Example 2 above and oxidation of the thiamorpholino group to the 1,1-dioxo-thiamorpholino group was per Larsson and Carlson (Acta Chemica Scan. 1994, 48, 522).

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.68 (d, 2H), 7.37 (d, 2H), 7.08 (m, 4H), 6.73 (d, 1H), 5.11 (m, 1H), 4.62 (m, 1H), 4.23 (m, 1H), 4.00 (m, 1H), 3.82 (m, 1H), 3.14 (s, 3H), 3.03 (s, 3H), 2.80 (m, 5H), 2.44 (s, 3H), 1.48 (s, 9H).

¹³C NMR (CDCl₃): δ=171.3, 169.9, 164.4, 145.6, 135.4, 132.6, 130.8, 130.4, 127.3, 121.9, 83.0, 56.1, 53.8, 49.4, 48.7, 44.5, 42.0, 36.9, 36.6, 36.4, 27.8, 21.5.

Example 15 Synthesis of N-(Toluene-4-sulfonyl)-L-[(1,1-dioxo)thiamorpholin-3-carbonyl]-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 14 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=7.77 (d, 2H), 7.40 (d, 2H), 7.22 (d, 2H), 7.00 (d, 2H), 5.19 (m, 1H), 4.65 (m, 1H), 4.30 (m, 1H), 3.95 (m, 1H), 3.61 (m, 1H), 3.20 (m, 5H), 3.09 (s, 3H), 2.97 (s, 3H), 2.43 (s, 3H).

¹³C NMR (CD₃OD): δ=174.1, 168.0, 157.0, 152.0, 146.4, 137.7, 135.3, 131.7, 131.6, 128.8, 123.0, 57.1, 54.8, 51.1, 50.9, 48.0, 47.7, 43.2, 37.4, 36.8, 36.7, 21.5.

Example 16 Synthesis of N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.74 (d, 2H), 7.33 (d, 2H), 7.25 (d, 2H), 7.20-7.00 (m, 3H), 4.74 (m, 1H), 4.55 (d, 1H), 4.38 (d, 1H), 3.83 (s, 1H), 3.66 (br m, 2H), 3.57 (br m, 2H), 3.08-3.05 (m, 2H), 2.45-2.42 (m, 7H), 2.33 (s, 3H), 1.42 (s, 9H), 1.15 (s, 3H), 1.08 (s, 3H).

¹³C NMR (CDCl₃): δ=169.7, 168.2, 153.6, 150.3, 144.7, 133.3, 132.7, 130.4, 129.9, 128.1, 121.5, 82.6, 73.4, 54.5, 53.7, 50.4, 46.0, 44.2, 43.6, 37.7, 28.9, 27.7, 23.8, 21.4.

Example 17 Synthesis of N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product Example 16 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=8.31 (d, 1H), 7.72 (d, 2H), 7.42-7.35 (m, 4H), 7.08 (d, 2H), 4.90-4.68 (m, 1H), 4.64-4.61 (m, 1H), 4.47-4.44 (m, 1H), 4.01 (s, 1H), 3.36-3.32 (br m, 4H), 3.27-3.25 (m, 1H), 3.22-3.10 (m, 1H), 2.94 (s, 3H), 2.43 (s, 3H), 1.14 (s, 3H), 1.07 (s, 3H).

Example 18 Synthesis of N-(Toluene-4-sulfonyl)sarcosyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.66 (d, 2H), 7.34 (d, 2H), 7.18 (d, 2H), 7.07 (d, 2H), 6.98 (d, 1H), 5.03 (m, 1H), 4.81 (m, 1H), 3.69 (d, 1H), 3.49 (d, 1H), 3.08 (m, 2H), 3.04 (s, 3H), 2.99 (s, 3H), 2.63 (s, 3H), 2.43 (s, 3H).

¹³C NMR (CDCl₃): δ=167.4, 154.9, 150.8, 144.4, 132.6, 130.2, 130.1, 127.7, 122.0, 110.9, 69.5, 57.3, 53.9, 53.0, 37.1, 36.6, 21.6, 21.4.

Example 19 Synthesis of N-(Toluene-4-sulfonyl)sarcosyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.67 (d, 2H), 7.34 (d, 2H), 7.19 (d, 2H), 7.03 (d, 2H), 6.98 (d, 1H), 4.76 (m, 1H), 3.67 (q, 1H), 3.06 (m, 2H), 3.16 (s, 3H), 2.99 (s, 3H), 2.64 (s, 3H), 2.43 (s, 3H), 1.42 (s, 9H).

¹³C NMR (CDCl₃): δ=170.0, 137.2, 154.9, 150.7, 144.3, 133.2, 132.9, 130.3, 130.0, 127.7, 121.9, 82.6, 83.9, 53.3, 37.2, 36.6, 36.4, 27.9, 21.4.

Example 20 Synthesis of N-(Toluene-4-sulfonyl)sarcosyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 18 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.41 (d, 2H), 7.10 (d, 2H), 6.98 (d, 2H), 6.75 (d, 2H), 4.42 (m, 1H), 3.43 (m, 2H), 3.04 (m, 2H), 2.80 (s, 3H), 2.69 (s, 3H), 2.33 (s, 3H), 2.14 (s, 3H).

¹³C NMR (CDCl₃): δ=174.2, 170.2, 156.9, 151.9, 145.6, 135.5, 135.2, 131.4, 131.1, 128.9, 123.0, 54.6, 54.0, 37.4, 36.8, 36.7, 21.4.

Example 21 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylaminosulfonyloxy)phenylalanine tert-Butyl Ester

Substituting dimethysulfamoyl chloride for dimethylcarbamyl chloride, and following the method for the preparation of Example 2, gave the title compound.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.72 (d, 2H), 7.34 (d, 2H), 7.21 (s, 4H), 4.69 (m, 1H), 4.04 (m, 1H), 3.4 (m, 1H), 3.24 (m, 3H), 2.96 (s, 6H), 2.42 (s, 3H), 2.02 (m, 1H), 1.45 (m, 3H).

¹³C NMR (CDCl₃): δ=166.3, 165.3, 144.8, 140.0, 130.9, 126.4, 125.6, 123.5, 117.3, 95.5, 78.3, 57.8, 49.2, 45.2, 34.2, 32.9, 25.0, 23.4, 19.7, 17.1.

Example 22 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylaminosulfonyloxy)phenylalanine

The title compound was prepared from the product of Example 21 using the procedure described in method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=7.73 (d, 2H), 7.41 (d, 2H), 7.38 (d, 2H), 7.22 (d, 2H), 4.69 (m, 1H), 4.11 (m, 1H), 3.41 (m, 2H), 3.19 (m, 2H), 2.94 (s, 6H), 2.41 (s, 3A), 1.78 (m, 1H), 1.61 (m, 3H).

¹³C NMR (CD₃OD): δ=174.3, 174.0, 150.8, 145.9, 137.3, 135.1, 132.1, 131.2, 129.1, 123.1, 63.3, 54.6, 50.6, 39.1, 37.5, 31.6, 25.3, 21.5.

Example 23 Synthesis of N-(Toluene-4-sulfonyl)-sarcosyl-L-(4-morpholinecarbamyloxy) phenylalanine t-butyl ester

Substituting sacrosine for L-proline in the preparation of Ts-Pro-Tyr(H)—O-t-butyl ester and substitution of 4-morpholinecarbonyl chloride for dimethylcarbamyl chloride, and following the method for the preparation of Example 2, gave the title compound as a white solid.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.61 (d, 2H), 7.28 (d, 2H), 7.16 (d, 2H), 7.02 (d, 2H), 4.69 (m, 1H), 3.67 (m, 8H), 3.58 (m, 1H), 3.48 (m, 1H), 3.06 (m, 2H), 2.59 (s, 3H), 2.36 (s, 3H), 1.26 (s, 9H).

¹³C NMR (CDCl₃): δ 169.7, 167.1, 153.5, 150.1, 144.1, 133.1, 133.0, 133.0, 130.1, 129.8, 127.4, 121.6, 82.6, 66.3, 53.6, 53.1, 44.5, 43.7, 36.9, 36.4, 27.6, 21.2.

Example 24 Synthesis of N-(Toluene-4-sulfonyl)sarcosyl-L-4-(isonipecotoyloxy)phenylalanine

The title compound was prepared from the product of Example 23 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=7.30 (d, 2H), 7.02 (d, 2H), 6.88 (d, 2H), 6.67 (d, 2H), 4.33 (m, 1H), 3.32 (m, 3H), 3.25 (m, 2H), 3.12 (m, 3H), 2.89 (m, 1H), 2.70 (m, 3H), 2.22 (s, 3H), 2.03 (s, 3H).

¹³C NMR (CD₃OD): δ=174.2, 170.3, 155.6, 151.7, 145.6, 135.8, 135.2, 131.5, 131.1, 128.9, 123.0, 67.5, 54.6, 54.0, 37.4, 36.8, 21.5.

Example 25 Synthesis of N-(Toluene-4-sulfonyl)-L-[(1,1-dioxo)thiamorpholin-3-carbonyl]-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

Substitution of 4-morpholinecarbonyl chloride for dimethylcarbamyl chloride, and following the methods for the preparation of Example 2 and 14, gave the title compound as a white solid.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.76 (d, 1H), 7.68 (d, 1H), 7.37 (m, 2H), 7.14 (m, 2H), 7.05 (m, 1H), 6.97 (d, 1H), 6.80 (d, 0.5H), 6.57 (d, 0.5H), 5.09 (m, 0.5H), 4.91 (m, 0.5H), 4.75 (m, 0.5H), 4.62 (m, 0.5H), 4.25 (m, 0.5H), 4.09 (m, 2H), 3.79 (m, 4H), 3.65 (m, 4H), 2.91 (s, 3H), 2.44 (s, 3H), 1.69 (s, 4H), 1.44 (s, 5H).

¹³C NMR (CDCl₃): δ=170.0, 169.8, 164.8, 164.4, 153.7, 150.4, 145.6, 145.4, 135.4, 135.3, 132.9, 130.8, 130.7, 130.5, 130.4, 127.5, 127.2, 122.1, 121.8, 83.01, 82.8, 66.4, 56.1, 56.1, 53.7, 53.6, 49.5, 49.3, 48.6, 44.7, 43.9, 42.0, 41.6, 36.9, 36.3, 27.8, 21.5.

Example 26 Synthesis of N-(Toluene-4-sulfonyl)-L-[(1,1-dioxo)thiamorpholin-3-carbonyl]-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 25 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=7.67 (m, 2H), 7.32 (m, 2H), 7.08 (m, 2H), 6.93 (m, 2H), 5.09 (m, 1H), 4.54 (m, 1H), 4.19 (m, 0.5H), 4.02 (m, 0.5H), 3.81 (m, 0.5H), 3.66 (m, 8H), 2.99 (m, 7H), 2.32 (s, 3H).

¹³C NMR (CD₃OD): δ 174.0, 168.0, 155.7, 151.9, 151.8, 146.6, 146.4, 137.5, 135.5, 135.3, 131.7, 131.6, 131.6, 128.8, 123.3, 122.9, 67.6, 57.3, 57.1, 54.8, 51.1, 50.9, 50.6, 46.0, 45.3, 45.2, 43.0, 37.4, 37.0, 21.5.

Example 27 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹³C NMR (CDCl₃): δ=7.87-7.83 (m, 2H), 7.26-7.13 (m, 5H), 4.74-4.69 (m, 1H), 4.05 (m, 1H), 3.36 (m, 1H), 3.24-3.17 (m, 1H), 3.11-3.01 (m, 4H), 2.97 (s, 3H), 2.05-2.02 (m, 1H), 1.60-1.47 (m, 3H), 1.46 (s, 9H).

¹³C NMR (CDCl₃): δ=170.6, 170.0, 165.7, 154.9, 150.6, 133.2, 132.4, 130.7, 130.2, 121.7, 116.7, 82.7, 62.3, 53.7, 49.6, 37.2, 36.6, 36.4, 29.9, 27.9, 24.2.

Example 28 Synthesis of N-(Toluene-4-sulfonyl)sarcosyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=8.17 (d, 1H), 7.59 (d, 2H), 7.26 (d, 2H), 7.13 (d, 2H), 7.00 (d, 2H), 4.66 (m, 1H), 3.60 (m, 6H), 3.04 (m, 2H), 2.56 (s, 3H), 2.40 (m, 7H), 2.34 (s, 3H), 1.41 (s, 9H).

¹³C NMR (CDCl₃): δ=169.7, 167.0, 153.4, 150.2, 144.0, 133.0, 132.9, 130.1, 129.8, 127.4, 121.6, 82.2, 54.3, 53.5, 53.1, 45.8, 44.2, 43.5, 36.9, 27.6, 21.2.

Example 29 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxo-5,5-dimethyl)-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The product of Example 12 was oxidized by the method of Larsson and Carlson (Acta Chemica Scan. 1994, 48, 517-525), yielding the title compound as a white solid.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.73 (d, 2H), 7.36 (d, 2H), 7.21 (d, 2H), 7.06-6.95 (m, 3H), 4.79 (m, 1H), 4.38 (dd, 2H), 4.10 (s, 1H), 3.18-2.95 (m, 8H), 2.43 (s, 3H), 1.45 (s, 9H), 1.33 (s, 3H), 1.08 (s, 3H).

¹³C NMR (CDCl₃): δ=169.8, 166.2, 154.9, 120.7, 145.8, 133.0, 131.9, 130.2, 128.5, 121.9, 82.9, 68.0, 60.9, 59.3, 53.9, 37.5, 36.6, 36.3, 27.7, 21.6, 19.3, 18.5.

Example 30 Synthesis of N-(1-Methylimidazolyl-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 106 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=8.07 (d, 1H), 7.75 (s, 1H), 7.71 (s, 1H), 7.25 (d, 2H), 7.01 (d, 2H), 4.71-4.66 (m, 1H), 4.28-4.24 (m, 1H), 3.77 (s, 3H), 3.42-3.05 (m, 3H), 3.09 (s, 3H), 2.96 (s, 3H), 1.84-1.69 (m, 2H), 1.61-1.54 (m, 2H).

¹³C NMR (CDCl₃): δ=174.4, 174.1, 156.9, 151.9, 141.8, 137.7, 135.6, 131.6, 127.6, 122.9, 63.7, 54.7, 50.8, 37.4, 36.8, 36.7, 34.3, 31.6, 25.4.

Preparative Example A Synthesis of 2-(Saccharin-2-yl)propionoyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

N-(Benzisothiazolone)-L-alanyl-L-tyrosine t-butyl ester was prepared by first combining sodium hydride (washed free of mineral oil) in THF chilled to 0° C., and a solution of N-(2-methoxycarbonyl)sulfonyl-L-alanine-L-tyrosine t-butyl ester in THF which was added dropwise. The reaction was stirred at 0° C. for one hour and then at room temperature for two hours. The reaction mixture was extracted with EtOAc and 0.2 N HCl, the combined EtOAc layers were washed successively with 0.2 N HCl, satd. NaHCO₃, and satd. NaCl. The organic layer was dried over MgSO₄, filtered and concentrated. The residue was filtered by silica gel chromatography to afford N-(benzisothiazolone)-L-alanyl-L-tyrosine t-butyl ester.

The title compound was then prepared following the procedure described in Example 2.

NMR data was as follows:

¹H NMR (DMSO-d₆,400 MHz) (1:1 mixture of diastereomers) δ=8.15 (m, 2H); 8.5 (m, 3H); 7.20 (m, 2H); 6.95 (m, 2H); 4.75 (m, 1H); 4.30 (m, 1H); 3.05 (s, 3H); 2.95 (m, 2H); 2.90 (s, 3H); 1.75 and 1.65 (two d, 3H); 1.30 and 1.35 (two s, 9H).

Example 31 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxo-5,5-dimethyl)-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 29 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.75 (m, 3H), 7.29 (m, 4H), 7.08 (d, 2H), 4.95 (m, 1H), 4.46-4.20 (m, 3H), 3.17 (s, 3H), 3.30-3.10 (m, 2H), 3.02 (s, 3H), 2.43 (s, 3H), 1.15 (s, 3H), 0.88 (s, 3H).

¹³C NMR (CDCl₃): δ=127.2, 167.5, 155.8, 150.3, 145.4, 133.6, 132.6, 130.8, 130.2, 128.3, 121.9, 67.9, 65.8, 60.8, 53.9, 36.8, 36.6, 35.8, 21.6, 18.8, 15.0.

Example 32 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 27 using the procedure described in Method 11.

NMR data was as follows:

¹³C NMR (CDCl₃): δ=7.88-7.84 (m, 2H), 7.54 (d, 1H), 7.26-7.18 (m, 4H), 7.01 (d, 2H), 6.92 (s, 3H), 4.88-4.83 (m, 1H), 4.14-4.11 (m, 1H), 3.39-3.29 (m, 2H), 3.13 (m, 2H), 3.00 (s, 3H), 2.99 (s, 3H), 1.92-1.89 (m, 1H), 1.59-1.43 (m, 3H).

¹³C NMR (CDCl₃): δ=173.1, 172.4, 165.6, 155.5, 150.4, 133.2, 131.9, 130.6, 130.3, 121.8, 116.6, 61.9, 53.1, 49.6, 36.6, 36.3, 30.2, 23.9.

Example 33 Synthesis of N-(Toluene-4-sulfonyl)-D-prolyl-L-4-(4-methylpiperazin-1-yl)phenylalanine t-butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹³C NMR (CDCl₃): δ=7.72 (d, 2H), 7.33 (d, 3H), 7.17 (d, 2H), 7.02 (d, 2H), 4.71 (q, 1H), 4.09-4.06 (m, 1H), 3.67 (bs, 2H), 3.57 (bs, 2H), 3.41-3.34 (m, 1H), 3.22 (dd, 1H), 3.16-3.09 (m, 1H), 3.03 (dd, 1H), 2.46-2.43 (m, 7H), 2.05-2.02 (m, 1H), 1.57-1.43 (m, 3H), 1.47 (s, 9H).

¹³C NMR (CDCl₃): δ=170.8, 169.9, 153.6, 150.4, 144.3, 133.4, 133.1, 130.3, 130.0, 127.9, 121.6, 82.6, 62.3, 54.5, 53.8, 49.6, 46.1, 44.3, 43.7, 37.3, 29.7, 27.8, 24.1, 21.4.

Example 34 Synthesis of N-(Toluene-4-sulfonyl)-N-methyl-L-alanyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine t-butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.68 (d, 2H), 7.31 (d, 2H), 7.17 (d, 2H), 7.04 (d, 2H), 6.86 (d, 1H), 4.65 (m, 1H), 4.47 (q, 1H), 3.71-3.53 (m, 4H), 3.24-2.92 (m, 2H), 2.50-2.40 (m, 10H), 2.35 (s, 3H), 1.45 (s, 9H), 0.92 (d, 3H).

¹³C NMR (CDCl₃): δ=170.1, 169.9, 153.6, 150.4, 143.9, 135.6, 133.3, 130.2, 129.9, 127.2, 121.8, 82.4, 55.4, 54.6, 53.6, 46.0, 44.2, 43.7, 37.2, 29.6, 27.8, 21.4, 11.5.

Example 35 Synthesis of N-(4-Nitrobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=8.38-8.34 (m, 2H), 8.05-8.00 (m, 2H), 7.16-2.12 (m, 2H), 7.03-6.94 (m, 3H), 4.74-4.68 (m, 1H), 4.15-4.14 (m, 1H), 3.41-3.32 (m, 1H), 3,23-3.14 (m, 2H), 3.08 (s, 3H), 3.03 (m, 1H), 2.98 (s, 3H), 2.05 (m, 1H), 1.66-1.48 (m, 3H), 1.47 (s, 9H).

¹³C NMR (CDCl₃): δ=170.0, 169.9, 154.8, 150.6, 150.4, 142.4, 132.9, 130.2, 129.0, 124.5, 121.6, 82.7, 62.2, 53.4, 49.4, 37.0, 36.5, 36.2, 30.1, 27.7, 24.1.

Example 36 Synthesis of N-Troluene-4-sulfonyl)-L-[(1,1-dioxo)-thiamorpholin-3-carbonyl]-L-4-(N,N-dimethylaminosulfonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared using the procedure described for the preparation of Example 21 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.73 (d, 1H), 7.67 (d, 1H), 7.35 (m, 2H), 7.27 (m, 2H), 6.88 (d, 1H), 6.66 (d, 1H), 5.08 (m, 0.5H), 4.97 (m, 0.5H), 4.71 (m, 0.5H), 4.61 (m, 0.5H), 4.25 (m, 0.5H), 4.03 (m, 1H), 3.21-3.04 (m, 4H), 2.89 (s, 3H), 2.83 (s, 3H), 2.78 (m, 3H), 2.42 (s, 3H), 1.44 (s, 4.5H), 1.38 (s, 4.5H).

¹³C NMR (CDCl₃): δ=169.8, 169.6, 164.9, 164.5, 149.3, 149.1, 145.6, 145.4, 135.4, 135.0, 134.6, 130.9, 130.6, 130.5, 127.4, 127.2, 122.0, 121.8, 83.0, 83.0, 56.0, 53.7, 49.2, 49.1, 48.5, 41.9, 41.4, 38.6, 36.8, 36.2, 27.7, 21.5.

Example 37 Synthesis of N-(Toluene-4-sulfonyl)sarcosyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

Substituting thiomorpholine for N-methylpiperazine, and following the method for the preparation of Example 4, gave the title compound.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.65 (d, 2H), 7.33 (d, 2H), 7.20 (d, 2H), 7.04 (d, 2H), 4.76 (m, 1H), 3.89 (m, 4H), 3.68 (d, 1H), 3.48 (d, 1H), 3.10 (m, 2H), 2.66 (m, 7H), 2.41 (s, 3H), 1.43 (s, 9H).

¹³C NMR (CDCl₃): δ=169.9, 167.2, 153.5, 150.3, 144.3, 133.1, 130.3, 130.0, 127.6, 121.8, 82.5, 53.8, 53.3, 47.0, 36.4, 37.2, 36.6, 27.8, 27.3, 27.0, 21.4.

Example 38 Synthesis of N-(Toluene-4-sulfonyl)-L-N-methylalanyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 34 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.65 (d, 2H), 7.34 (d, 2H), 7.27 (d, 2H), 7.09 (d, 12H), 4.64-4.50 (m, 2H), 4.48-4.23 (m, 2H), 3.60-2.96 (m, 8H) 2.92 (s, 3H), 2.55 (s, 3H), 2.40 (s, 3H), 0.93 (d, 3H).

¹³C NMR (CDCl₃): δ=174.3, 173.1, 154.9, 151.6, 145.5, 137.0, 136.1, 131.6, 131.2, 128.5, 123.1, 56.4, 54.8, 54.0, 43.8, 37.3, 30.2, 21.5, 13.2.

Example 39 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 81 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=8.03 (m, 1H), 7.73 (d, 2H), 7.41 (d, 2H), 7.28 (d, 2H), 7.08 (d, 2H), 4.70-4.65 (m, 1H), 4.12-4.00 (m, 5H), 3.38-3.36 (m, 1H), 3.31-3.06 (m, 7H), 2.43 (s, 3H), 1.77-1.48 (m, 5H).

¹³C NMR (CD₃OD): δ=168.4, 159.1, 130.0, 129.1, 125.6, 125.1, 123.0, 116.9, 57.2, 48.8, 46.3, 44.5, 31.5, 25.6, 19.3, 15.4.

Example 40 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 82 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=7.73 (d, 2H), 7.41 (d, 2H), 7.27 (d, 2H), 7.04 (d, 2H), 4.68-4.65 (m, 1H), 4.10-4.07 (m, 1H), 3.90 (t, 2H), 3.77 (t, 2H), 3.38-3.11 (m, 4H), 2.66 (m, 4H), 2.43 (s, 3H), 1.80-1.48 (m, 5H).

¹³C NMR (CD₃OD): δ=168.4, 168.2, 149.4, 145.7, 139.8, 129.7, 129.0, 125.6, 125.1, 123.1, 116.9, 57.2, 48.8, 44.6, 42.1, 36.0, 31.4, 25.7, 22.1, 21.8, 19.3, 15.4.

Example 41 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(isonipecotoyloxy)phenylalanine

The title compound was prepared from the product of Example 80 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=8.08 (m, 1H), 7.73 (d, 2H), 7.41 (d, 2H), 7.27 (d, 2H), 7.03 (d, 2H), 4.71 (m, 1H), 4.11-4.08 (m, 1H), 3.61 (t, 2H), 3.47-3.38 (m, 3H), 3.31-3.11 (m, 4H), 2.43 (s, 3H), 1.77-1.47 (m, 10H).

¹³C NMR (CD₃OD): δ=168.3, 168.1, 158.8, 149.6, 145.9, 139.8, 129.5, 129.0, 125.6, 125.1, 123.1, 116.9, 57.2, 48.6, 44.6, 40.6, 40.1, 36.0, 31.4, 25.7, 20.9, 20.6, 19.3.

Example 42 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(pyrrolidin-1-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 83 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=8.08 (m, 1H), 7.73 (d, 2H), 7.41 (d, 2H), 7.04 (d, 2H), 7.27 (d, 2H), 4.72-4.68 (m, 1H), 4.11-4.08 (m, 1H), 3.57-3.53 (t, 2H), 3.43-3.28 (m, 3H), 3.25-3.06 (m, 4H), 2.43 (s, 3H), 1.99-1.80 (m, 4H), 1.78-1.49 (m, 5H).

¹³C NMR (CD₃OD): δ=168.2, 158.3, 149.2, 145.8, 139.8, 129.4, 129.1, 125.6, 125.1, 123.1, 116.9, 57.2, 48.7, 44.5, 41.5, 31.4, 25.7, 20.6, 19.8, 19.3, 15.4.

Example 43 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(morpholinyl-4-carbonyloxy)phenylalanine

The title compound was prepared from the product of Example 108 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=7.73 (d, 2H), 7.41 (d, 2H), 7.27 (d, 2H), 7.04 (d, 2H), 4.95-4.93 (m, 1H), 4.10-4.07 (m, 1H), 3.71-3.65 (m, 6H), 3.50 (t, 2H), 3.40-3.10 (m, 4H), 2.43 (s, 3H), 1.78-1.48 (m, 4H).

¹³C NMR (CD₃OD): δ=168.4, 168.2, 149.6, 145.7, 139.8, 129.1, 125.6, 125.1, 123.1, 116.8, 61.5, 57.2, 44.5, 36.0, 31.4, 25.6, 19.3, 15.4.

Example 44 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine Neopentyl Ester

Titanium isopropoxide (0.3 equivalents) was added to Tos-Pro-Tyr ethyl ester (1 equivalent) and an excess of neopentyl alcohol. The mixture was heated to reflux under an argon atmosphere overnight. Excess neopentyl alcohol was removed under reduced pressure and the residue purified by flash column chromatography (silica, hexane: EtOAc 2:1) to give the neopentyl ester a white solid (0.9 g, 85%). The title compound was prepared following the procedure described in Example 4.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz) δ=8.29 (d, 1H, J=7.91 Hz); 7.68 (d, 2H, J=8.45 Hz); 7.40 (d, 2H, J=8.34 Hz); 7.24 (d, 2H, J=8.57 Hz); 7.00 (d, 2H, J=8.57 Hz); 4.56 (m, 1H); 4.07 (m, 1H); 3.73 (s, 2H); 3.55 (br s, 2H); 3.40 (m, 3H); 3.10 (m, 3H); 2.40 (s, 3H); 2.35 (br s, 4H); 2.20 (s, 3H); 1.55 (m, 3H); 1.37 (m, 1H); 0.85 (s, 9H).

Example 45 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Neopentyl Ester

Titanium isopropoxide (0.3 equivalents) was added to Tos-Pro-Tyr ethyl ester (1 equivalent) and an excess of neopentyl alcohol. The mixture was heated to reflux under an argon atmosphere overnight. Excess neopentyl alcohol was removed under reduced pressure and the residue purified by flash column chromatography (silica, hexane: EtOAc 2:1) to give the neopentyl ester a white solid (0.9 g, 85%). The title compound was prepared following the procedure described in Example 2.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz) δ=8.28 (d, 1H, J=8.13 Hz); 7.68 (d, 2H, J=8.4 Hz); 7.40 (d, 2H, J=7.9 Hz); 7.23 (d, 2H, J=8.56 Hz), 6.99 (d, 2H, J=8.35 Hz); 4.57 (m, 3H); 2.40 (s, 3H); 1.55 (m, 3H); 1.38 (m, 1H); 0.85 (s, 9H).

Example 46 Synthesis of 2-(Saccharin-2-yl)propionoyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described in Preparative Example A and Example 4.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz) (1:1 mixture of diastereomers) δ=8.31 (m, 1H); 8.26 (m, 1H); 8.03 (m, 3H); 7.20 (m, 2H); 7.00 (m, 2H); 4.73 (m, 1H); 4.30 (m, 1H); 3.58 (br s, 2H); 3.40 (br s, 2H); 3.02 (m, 1H); 2.95 (m, 1H); 2.35 (br s, 4H); 2.20 (s, 3H); 2.75 and 2.65 (two d, 3H); 1.35 and 1.32 (two s, 9H).

Example 47 Synthesis of 2-(Saccharin-2-yl)propionoyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Preparative Example A using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz) (1:1 mixture of diastereomers) δ=12.75 (br s, 1H); 8.28 (m, 2H); 8.05 (m, 3H); 7.20 (m, 2H); 7.00 and 9.95 (two d, 2H); 4.75 (m, 1H); 4.40 (m, 1H); 3.10 (m, 1H); 3.05 (s, 3H); 2.95 (m, 1H); 2.90 (s, 3H); 2.75 and 2.60 (two d, 3H).

Example 48 Synthesis of N-(Toluene-4-sulfonyl)-L-N-methylalanyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure for the synthesis of Example 2 with the substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.68 (d, 2H), 7.31 (d, 2H), 7.17 (d, 2H), 7.04 (d, 2H), 6.87 (d, 2H), 4.67 (m, 1H), 4.48 (q, 1H), 3.09 (s, 3H), 3.00 (s, 3H), 3.14-2.92 (m, 2H), 2.46 (s, 3H), 2.43 (s, 3H), 1.45 (s, 9H), 0.92 (d, 3H).

¹³C NMR (CDCl₃): δ=170.2, 169.9, 154.9, 150.6, 143.9, 135.6, 133.2, 130.2, 130.0, 127.3, 121.9, 82.5, 55.5, 53.7, 37.2, 36.6, 36.4, 29.7, 27.8, 21.4, 11.5.

Example 49 Synthesis of N-(Toluene-4-sulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

L-Thiamorpholine-3-carboxylic acid was prepared by the method of Larsson and Carlson (Acta Chemica Scan. 1994, 48, 517-525). N-(Toluene-4-sulfonyl)-L-thiamorpholine-3-carboxylic acid was prepared using the procedure described in Method 1. The title compound was prepared following the procedure for the synthesis of Example 2 with substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.69 (d, 2H), 7.31 (d, 2H), 7.16 (d, 2H), 6.98 (d, 2H), 6.86 (d, 1H), 4.71 (m, 1H), 4.62 (m, 1H), 3.94 (m, 1H), 3.31 (m, 1H), 3.09 (m, 4H), 2.98 (s, 3H), 2.67 (m, 1H), 2.50 (m, 1H), 2.40 (s, 3H), 2.31 (m, 1H), 2.10 (m, 1H), 1.49 (s, 9H).

¹³C NMR (CDCl₃): δ=169.9, 167.4, 154.8, 150.6, 144.2, 136.8, 132.8, 130.4, 130.2, 127.3, 121.8, 82.6, 55.2, 54.0, 43.3, 36.5, 36.3, 27.8, 25.2, 24.6, 21.4.

Example 50 Synthesis of N-(Toluene-4-sulfonyl)sarcosyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 121 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=7.67 (d, 2H), 7.40 (d, 2H), 7.27 (d, 2H), 7.09 (d, 2H), 4.61 (m, 1H), 4.12 (m, 2H), 3.99 (m, 2H), 3.60 (m, 2H), 3.23 (m, 8H), 2.58 (s, 3H), 2.42 (s, 3H).

¹³C NMR (CD₃OD): δ=174.2, 170.3, 155.0, 151.6, 145.6, 136.1, 135.2, 131.5, 131.1, 128.9, 123.0, 54.6, 54.0, 52.4, 52.2, 44.4, 44.0, 37.4, 36.8, 21.4.

Example 51 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared from the product of Example 49 following the procedure described by Larsson and Carlson (Acta Chemica Scan. 1994, 48, 522).

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.76 (d, 2H), 7.37 (d, 2H), 7.08 (d, 2H), 6.98 (d, 2H), 6.56 (d, 1H), 4.95 (m, 1H), 4.62 (m, 1H), 3.99 (m, 2H), 3.25 (m, 1H), 3.07 (s, 3H), 2.97 (m, 8H), 2.44 (s, 3H), 1.48 (s, 9H).

¹³C NMR (CDCl₃): δ=170.0, 164.8, 154.9, 150.7, 145.4, 135.3, 132.6, 130.7, 130.3, 127.5, 122.3, 82.8, 56.1, 53.6, 49.5, 48.6, 41.6, 36.6, 36.4, 27.9, 21.6.

Example 52 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(morpholin 4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 71.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.75 (d, 2H), 7.36 (d, 2H), 7.12 (d, 2H), 6.98 (d, 2H), 6.58 (d, 1H), 4.93 (m, 1H), 4.63 (m, 1H), 4.09 (m, 2H), 3.72 (m, 4H), 3.63 (m, 2H), 3.51 (m, 2H), 3.24 (m, 1H), 2.96 (m, 4H), 2.43 (s, 3H), 1.46 (s, 9H).

¹³C NMR (CDCl₃): δ=170.0, 164.8, 153.7, 150.4, 145.4, 135.2, 132.9, 130.7, 130.4, 127.5, 122.1, 82.9, 66.4, 56.1, 53.6, 49.4, 48.5, 44.7, 43.9, 41.6, 36.3, 27.8, 21.6.

Example 53 Synthesis of N-(Toluene-4-sulfonyl)-L-N-methylalanyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 48 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.68 (d, 2H), 7.31 (d, 2H), 7.20 (d, 2H), 7.11-7.04 (m, 3H), 6.35 (br s, 1H), 4.81 (m, 1H), 4.52 (q, 1H), 3.35-2.98 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 2.45 (s, 3H), 2.43 (s, 3H), 0.91 (d, 3H).

¹³C NMR (CDCl₃): δ=173.7, 170.8, 155.2, 150.6, 144.0, 135.4, 133.2, 130.2, 130.0, 127.3, 122.1, 55.5, 53.2, 36.6, 36.5, 36.4, 29.8, 21.4, 11.6.

Example 54 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

L-Thiamorpholine-3-carboxylic acid was prepared by the method of Larsson and Carlson (Acta Chemica Scan. 1994, 4, 517-525). N-(Toluene-4-sulfonyl)-L-thiamorpholine-3-carboxylic acid was prepared using the procedure described in Method 1.

The title compound was then prepared following the procedure for the synthesis of Example 2.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.87-7.82 (m, 2H), 7.20 (t, 2H), 7.16 (d, 2H), 7.00 (d, 2H), 6.76 (d, 1H), 4.74 (t, 1H), 4.65 (q, 1H), 3.92 (d, 1H), 3.32 (dd, 1H), 3.17-3.00 (m, 2H), 3.09 (s, 3H), 2.99 (s, 3H), 2.76-2.66 (m, 1H), 2.62 (dd, 1H), 2.46 (dt, 1H), 2.22 (d, 1H), 1.49 (s, 9H).

¹³C NMR (CDCl₃): δ=170.0, 167.2, 165.5, 154.8, 150.7, 135.8, 132.7, 130.5, 130.1, 121.9, 116.9, 82.8, 55.3, 53.9, 43.4, 36.6, 36.4, 36.3, 27.9, 25.8, 25.0.

Example 55 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared from the product of Example 54 following the procedure described by Larsson and Carlson (Acta Chemica Scan. 1994, 48, 522).

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.92-7.88 (m, 2H), 7.24 (t, 2H), 7.09 (d, 2H), 6.97 (d, 2H), 6.41 (d, 1H), 4.96 (d, 1H), 4.62 (d, 1H), 4.03 (d, 1H), 3.26 (dd, 1H), 3.13-2.92 (m, 6H), 3.09 (s, 3H), 2.97 (s, 3H), 1.49 (s, 9H).

¹³C NMR (CDCl₃): δ=170.1, 165.9, 164.5, 154.9, 150.7, 134.0, 132.4, 130.5, 130.4, 122.2, 117.3, 83.0, 56.1, 53.4, 50.0, 49.1, 41.7, 36.6, 36.3, 36.1, 27.9.

Example 56 Synthesis of N-(Pyridine-3-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

N-Benzyl-L-prolyl was coupled to L-tyrosine t-butyl ester using the procedure described in Method 12. N-Benzyl-L-prolyl-L-(N,N-dimethylcarbamyloxy)phenylalanine t-butyl ester was prepared following the procedure described for the preparation of Example 2. L-Prolyl-L-(4-N,N-dimethylcarbamyloxy)phenylalanine t-butyl ester was prepared from the product of the previous reaction using the procedure described in Method 4. The title compound was prepared using the procedure described for the preparation of 3-pyridine sulfonyl chloride (see Crowell, et al., J. Med. Chem., 1989, 32, 2436-2442) and the product of the last reaction.

NMR data was as follows:

¹H NMR (CDCl₃): δ=9.95 (d, 1H), 8.83 (dd, 1H), 8.14-8.10 (m, 1H), 7.51-7.47 (m, 1H), 7.16-7.13 (m, 3H), 7.02-6.99 (m, 2H), 4.72-4.69 (m, 1H), 4.09-4.06 (m, 1H), 3.41-3.39 (m, 1H), 3.23-3.17 (m, 1H), 3.13-2.98 (m, 1H), 3.07 (s, 3H), 2.97 (s, 3H), 2.04 (m, 1H), 1.59-1.47 (m, 3H), 1.45 (s, 9H).

¹³C NMR (CDCl₃): δ=170.1, 169.9, 154.8, 153.9, 150.5, 148.4, 135.5, 133.0, 130.1, 123.9, 121.6, 82.6, 52.2, 53.6, 49.5, 37.1, 36.5, 36.3, 29.9, 27.8, 24.0.

Preparative Example B Synthesis of N-(Primidine-2-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared by substituting 2-pyrimidine sulfonyl chloride (see Skulnick, et al., J. Med. Chem., 1997, 40, 1149-1164) and following the method for the preparation of Example 56.

NMR data was as follows:

¹H NMR (CDCl₃): δ=8.28 (d, 2H), 7.39 (d, 1H), 7.02 (d, 2H), 6.88 (d, 2H), 6.54 (m, 1H), 4.76-4.69 (m, 1H), 4.57-4.55 (m, 1H), 3.64 (m, 1H), 3.55-3.52 (m, 1H), 3.09-3.03 (m, 1H), 3.08 (s, 3H), 2.99-2.95 (m, 1H), 2.98 (s, 3H), 2.32 (m, 1H), 2.01-1.97 (m, 3H), 1.37 (s, 9H).

¹³C NMR (CDCl₃): δ=172.1, 170.4, 160.6, 157.7, 154.8, 150.3, 133.0, 130.1, 121.3, 110.5, 82.0, 60.7, 53.3, 47.5, 37.1, 36.5, 36.3, 28.9, 27.7, 24.1.

Example 57 Synthesis of N-(4-Nitrobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 35 using the procedure described in method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=8.36 (d, 2H), 8.02 (d, 2H), 7.42 (d, 1H), 7.20 (d, 2H), 7.01 (d, 2H), 4.86 (m, 1H), 4.18-4.15 (m, 1H), 3.46-3.43 (m, 1H), 3.32-3.26 (m, 1H), 3.19-3.11 (m, 2H), 3.09 (s, 3H), 3.01 (s, 3H), 1.91 (m, 1H), 1.65-1.54 (m, 3H).

¹³C NMR (CDCl₃): δ=172.9, 171.7, 155.5, 150.4, 150.4, 142.1, 133.2, 130.5, 129.1, 124.6, 121.8, 61.9, 52.9, 49.6, 36.6, 36.3, 36.3, 30.6, 24.1.

Example 58 Synthesis of N-(4-Cyanobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.94 (d, 2H), 7.82 (d, 2H), 7.13 (d, 2H), 7.05-6.99 (m, 3H), 4.71-4.66 (m, 1H), 4.12-4.09 (m, 1H), 3.36-3.35 (m, 1H), 3.22-3.11 (m, 2H), 3.07 (s, 3H), 3.06-3.01 (m, 1H), 2.97 (s, 3H), 2.05 (m, 1H), 1.63-1.37 (m, 3H), 1.46 (s, 9H).

¹³C NMR (CDCl₃): δ=170.1, 169.9, 154.8, 150.6, 140.8, 133.1, 132.9, 130.2, 128.4, 121.7, 117.1, 116.9, 82.7, 62.2, 53.4, 49.4, 37.0, 36.5, 36.3, 30.1, 27.8, 24.1.

Example 59 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylaminosulfonyloxy)phenylalanine

The title compound was prepared from the product of Example 36 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=7.79 (m, 2H), 7.44 (m, 2H), 7.27 (m, 2H), 7.17 (m, 2H), 5.21 (m, 1H), 4.64 (m, 1H), 4.14 (m, 1H), 3.61 (m, 2H), 3.24 (m, 2H), 3.08 (m, 2H), 2.89 (s, 6H), 2.80 (m, 2H), 2.43 (s, 3H).

¹³C NMR (CD₃OD): δ=173.9, 168.1, 168.0, 150.8, 150.8, 146.7, 146.5, 137.6, 137.5, 137.1, 136.9, 132.2, 132.1, 131.7, 131.6, 128.8, 123.3, 123.1, 57.3, 54.8, 51.0, 50.8, 50.5, 47.9, 47.8, 43.2, 43.0, 39.0, 39.0, 37.4, 37.0, 21.5.

Example 60 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 51 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.79 (d, 2H), 7.43 (d, 2H), 7.20 (d, 2H), 7.00 (d, 2H), 5.21 (m, 1H), 4.65 (m, 1H), 4.12 (m, 1H), 3.75 (m, 1H), 3.29 (m, 3H), 3.08 (s, 3H), 3.00 (m, 1H), 3.00 (m, 1H), 2.97 (s, 3H), 2.80 (m, 3H), 2.44 (s, 3H).

¹³C NMR (CDCl₃): δ=165.1, 159.0, 147.9, 143.1, 137.6, 128.6, 126.1, 122.7, 122.6, 119.8, 114.3, 48.3, 45.8, 41.6, 34.0, 28.0, 27.8, 27.7, 12.5.

Example 61 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxo)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared from N-(toluene-4-sulfonyl)-L-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-butyl ester, prepared as per the examples herein, following the procedure described by by Larsson and Carlson (Acta Chemica Scan. 1994, 48, 522).

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.77 (d, 2H), 7.38 (d, 2H), 7.18 (m, 3H), 7.09 (d, 2H), 4.83-4.57 (m, 3H), 3.77-3.60 (m, 2H), 3.36-3.23 (m, 1H), 3.15-3.00 (m, 7H), 2.85-2.73 (m, 1H), 2.46 (s, 3H), 1.50 (s, 9H).

Example 62 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.96 (d, 2H), 7.80 (d, 2H), 7.26-7.13 (m, 3H), 7.01 (d, 2H), 4.72-4.70 (m, 1H), 4.11-4.08 (m, 1H), 3.40-3.37 (m, 1H), 3.25-3.10 (m, 2H), 3.07 (s, 3H), 3.04-3.02 (m, 1H), 2.98 (s, 3H), 2.06 (m, 1H), 2.06-2.04 (m, 1H), 1.61-1.52 (m, 3H), 1.46 (s, 9H).

¹³C NMR (CDCl₃): δ=170.3, 169.9, 154.9, 150.6, 139.9, 134.9, 133.1, 130.2, 128.4, 126.5, 121.7, 82.7, 62.3, 5.35, 49.6, 37.2, 36.6, 36.3, 30.0, 27.8 24.1.

Example 63 Synthesis of N-(1-Methylpyrazolylsulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 117 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=8.84 (br s, 1H), 7.93 (s, 1H), 7.79 (s, 1H), 7.68-7.65 (m, 1H), 7.18 (d, 2H), 6.99 (d, 2H), 4.88-4.81 (m, 1H), 4.08-4.06 (m, 1H), 3.92 (s, 3H), 3.45-3.40 (m, 1H), 3.34-3.27 (m, 1H), 3.11-3.01 (m, 5H), 2.97 (s, 3H), 1.82 (m, 1H), 1.66-1.57 (m, 2H), 1.45 (m, 1H).

¹³C NMR (CDCl₃): δ=173.1, 172.9, 159.1, 158.6, 150.4, 138.8, 133.4, 133.2, 130.3, 121.9, 117.3, 62.0, 53.1, 49.7, 39.4, 36.6, 36.5, 36.4, 30.4, 23.9.

Example 64 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxo)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 61 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=8.34 (d, 1H), 7.70 (d, 2H), 7.33 (d, 2H), 7.14 (d, 2H), 7.01 (d, 2H), 5.07 (m, 1H), 4.93 (m, 1H), 4.43 (d, 1H), 4.01 (d, 1H), 3.68 (m, 1H), 3.37 (m, 1H), 3.17 (s, 3H), 3.14 (m, 1H), 3.09 (s, 3H), 2.54 (m, 1H), 2.43 (s, 3H).

¹³C NMR (CDCl₃): δ=171.5, 166.4, 156.4, 150.5, 145.5, 134.2, 134.1, 131.4, 130.3, 128.1, 121.8, 64.3, 59.2, 53.7, 50.5, 36.9, 36.5, 35.8, 21.6.

Example 65 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 84 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.83 (m, 2H), 7.73 (d, 1H), 7.16 (m, 4H), 6.99 (d, 2H), 5.57 (br s, 1H), 4.87 (m, 1H), 4.76 (m, 1H), 4.53 (d, 1H), 4.10 (d, 1H), 3.34 (m, 1H), 3.22 (d, 2H), 3.12 (s, 3H), 3.04 (s, 3H), 2.43 (m, 1H).

¹³C NMR (CDCl₃): δ=172.1, 168.7, 155.7, 150.5, 133.6, 133.1, 130.8, 130.7, 121.7, 116.9, 116.6, 65.3, 53.3, 51.3, 36.8, 36.4, 36.1, 33.4.

Example 66 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 with the substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.91 (m, 2H), 7.26 (m, 4H), 7.02 (d, 2H), 6.96 (d, 1H), 4.75 (m, 1H), 4.55 (d, 1H), 4.42 (d, 1H), 3.86 (s, 1H), 3.08 (s, 3H), 3.05 (m, 2H), 3.00 (s, 3H), 1.43 (s, 9H), 1.17 (s, 3H), 1.16 (s, 3H).

¹³C NMR (CDCl₃): δ=169.9, 168.1, 167.6, 164.2, 154.9, 150.6, 133.1, 132.2, 131.0, 130.9, 130.4, 121.7, 116.9, 116.6, 82.7, 73.5, 54.7, 53.7, 50.5, 37.8, 36.6, 36.4, 29.1, 27.8, 23.8.

Example 67 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 68.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.91-7.87 (m, 2H), 7.27-7.25 (m, 2H), 7.15 (d, 2H), 6.51 (d, 1H), 4.93-4.90 (m, 1H), 4.64-4.58 (m, 1H), 4.14-3.99 (m, 7H), 3.28-2.90 (m, 10H), 1.47 (s, 9H).

¹³C NMR (CDCl₃): δ=170.1, 167.6, 164.5, 153.1, 149.8, 133.9, 133.4, 130.7, 130.5, 121.7, 117.4, 117.1, 83.1, 56.1, 53.4, 51.6, 49.9, 48.9, 43.1, 41.6, 36.2, 27.8.

Example 68 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

Substituting thiomorpholine for N-methylpiperazine, and following the method for the preparation of Examples 4 and oxidation of the sulfur group in the thiomorpholino ring per by Larsson and Carlson (Acta Chemica Scan. 1994, 48, 522) gave the title compound as a white solid.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.75 (d, 2H), 7.35 (d, 2H), 7.17 (d, 2H), 6.99 (d, 2H), 6.65 (d, 1H), 4.92-4.90 (m, 1H), 4.63-4.60 (m, 1H), 4.15-3.95 (m, 7H), 3.30-3.23 (m, 1H), 3.14 (t, 4H), 3.07-2.80 (m, 6H), 2.45 (s, 3H), 1.48 (s, 9H).

¹³C NMR (CDCl₃): δ=169.9, 164.8, 153.1, 149.8, 145.5, 135.1, 133.6, 130.7, 127.5, 121.8, 82.9, 60.3, 56.1, 53.7, 51.8, 49.3, 48.4, 43.1, 42.7, 41.5, 36.3, 27.8, 21.5.

Example 69 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described in Example 37 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.88-7.83 (m, 2H), 7.26-7.15 (m, 5H), 7.01 (d, 2H), 4.74-4.67 (m, 1H), 4.08-4.05 (m, 1H), 3.91-3.80 (m, 4H), 3.41-3.35 (m, 1H), 3.24-3.00 (m, 3H), 2.70-2.65 (t, 4H), 2.06-2.04 (m, 1H). 1.60-1.46 (m, 12H).

¹³C NMR (CDCl₃): δ=170.5, 169.8, 153.4, 150.2, 133.5, 130.7, 130.5, 130.3, 121.6, 116.8, 116.5, 82.6, 62.2, 53.6, 49.6, 47.0, 46.4, 37.2, 29.8, 27.8, 27.3, 27.0, 24.1.

Example 70 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 66 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.90 (m, 2H), 7.30-7.14 (m, 5H), 7.02 (d, 2H), 5.83 (br s, 1H), 4.90 (m, 1H), 4.57 (d, 1H), 4.40 (d, 1H), 3.96 (s, 1H), 3.09 (s, 3H), 3.28-3.02 (m, 2H), 3.00 (s, 3H), 1.13 (s, 6H).

¹³C NMR (CDCl₃): δ=173.2, 169.2, 164.2, 163.9, 155.3, 150.6, 133.1, 132.0, 131.0, 130.9, 130.6, 122.0, 117.0, 116.7, 73.3, 54.6, 53.3, 50.5, 37.0, 36.7, 36.4, 29.0, 23.7.

Example 71 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

Substituting 4-morpholinecarbamyl chloride for dimethylcarbamyl chloride, and following the methods for the preparation of Example 2, gave the title compound as a white solid.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.91-7.87 (m, 2H), 7.26-7.20 (m, 2H), 7.11 (d, 2H), 6.98 (d, 2H), 6.43 (d, 1H), 4.95-4.92 (m, 1H), 4.62-4.60 (m, 1H), 4.05-4.00 (m, 2H), 3.74 (t, 4H), 3.66-3.52 (m, 4H), 3.30-2.92 (m, 6H), 1.48 (s, 9H).

¹³C NMR (CDCl₃): δ=170.1, 164.5, 150.4, 134.6, 132.7, 130.5, 122.0, 117.4, 117.1, 83.1, 66.5, 56.1, 53.4, 49.9, 49.0, 44.7, 44.0, 41.6, 36.2, 27.8.

Example 72 Synthesis of N-(4-Trifluoromethoxybenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.89 (d, 2H), 7.35 (d, 2H), 7.25-7.13 (m, 3H), 7.01 (d, 2H), 4.70 (m, 1H), 4.09-4.06 (m, 1H), 3.39-3.36 (m, 1H), 3.24-3.01 (m, 5H), 2.98 (s, 3H), 2.05 (m, 1H), 1.62-1.47 (m, 3H), 1.46 (s, 9H).

¹³C NMR (CDCl₃): δ=170.4, 169.9, 154.9, 152.7, 150.6, 134.6, 113.2, 130.2, 130.1, 121.7, 120.2, 82.7, 62.2, 53.6, 49.6, 37.2, 36.6, 36.3, 29.9, 27.8, 24.1.

Example 73 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

Following the method for the preparation of Example 2 and oxidation of the sulfur group in the thiomorpholino ring per by Larsson and Carlson (Acta Chemica Scan. 1994, 48, 522) gave the title compound.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.70 (d, 2H), 7.31 (d, 2H), 7.04 (d, 2H), 6.93 (d, 2H), 6.59 (d, 1H), 5.01 (m, 2H), 4.65 (m, 1H), 4.01 (d, 1H), 3.90 (d, 1H), 3.25 (m, 1H), 3.00 (s, 3H), 2.82 (m, 8H), 2.37 (s, 3H), 1.22 (s, 3H), 1.20 (s, 3H).

¹³C NMR (CDCl₃): δ=170.3, 165.0, 154.6, 150.5, 145.1, 135.2, 132.3, 130.4, 130.0, 127.2, 122.1, 69.5, 55.9, 53.1, 49.1, 48.5, 41.4, 36.3, 36.1, 35.9, 21.4.

Example 74 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(1,1-dioxo-5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared from the product of Example 66 following the procedure described by Larsson and Carlson (Acta Chemica Scan. 1994, 48, 522).

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.88 (m, 2H), 7.24 (m, 4H), 7.05 (d, 2H), 6.95 (d, 1H), 4.80 (m, 1H), 4.40 (m, 2H), 4.10 (s, 1H), 3.17-3.03 (m, 2H), 3.10 (s, 3H), 3.01 (s, 3H), 1.47 (s, 9H), 1.36 (s, 3H), 1.11 (s, 3H).

¹³C NMR (CDCl₃): δ=169.8, 168.6, 166.0, 154.5, 150.8, 139.7, 133.0, 131.5, 131.4, 130.3, 122.0, 117.1, 116.8, 83.0, 68.0, 60.9, 59.3, 53.8, 37.4, 36.6, 36.4, 27.8, 18.9, 18.8.

Example 75 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxo-5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared from the product of Example 11 following the procedure described by Larsson and Carlson (Acta Chemica Scan. 1994, 48, 522).

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.75 (d, 2H), 7.38 (d, 2H), 7.21 (d, 2H), 7.03 (m, 3H), 5.08 (m, 1H), 4.89 (m, 1H), 4.38 (m, 2H), 4.10 (s, 1H), 3.22-3.04 (m, 2H), 3.10 (s, 3H), 3.00 (s, 3H), 2.43 (s, 3H), 1.26 (m, 9H), 1.09 (s, 3H).

¹³C NMR (CDCl₃): δ=170.3, 166.3, 150.8, 145.9, 132.8, 131.9, 130.3, 128.6, 122.0, 69.8, 68.0, 60.9, 59.4, 53.4, 37.4, 36.6, 36.4, 21.6, 21.5, 19.2, 18.6.

Example 76 Synthesis of N-(Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 74 using the procedure described in Method 11.

NMR data was as follows:

¹³C NMR (CDCl₃): δ=171.7, 167.9, 137.3, 164.5, 155.9, 150.4, 133.6, 131.8, 131.3, 131.2, 130.8, 121.9, 117.1, 116.8, 67.8, 60.9, 59.9, 53.8, 36.8, 36.6, 36.0, 19.1, 19.0.

Example 77 Synthesis of N-(Pyrimidine-2-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Preparative Example B using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=8.45 (br m, 2H), 8.22 (br s, 1H), 7.55 (d, 1H), 7.11 (d, 2H), 6.95 (d, 2H), 6.81 (m, 1H), 4.80-4.74 (m, 2H), 3.70 (m, 1H), 3.55 (m, 1H), 3.20-3.08 (m, 4H), 2.98 (s, 3H), 2.89-2.76 (m, 1H), 2.13-1.96 (m, 3H), 1.60 (m, 1H).

¹³C NMR (CDCl₃): δ=190.0, 173.6, 171.0, 155.2, 153.9, 150.6, 133.2, 130.1, 121.9, 110.3, 62.0, 55.1, 48.2, 36.6, 36.6, 36.3, 30.2, 23.4.

Example 78 Synthesis of N-(Toluene-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

Following the method for the preparation of Example 4 and oxidation of the sulfur group in the thiamorpholino ring per Larsson and Carlson (Acta Chemica Scan. 1994, 48, 522) gave the title compound.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.76 (d, 2H), 7.37 (d, 2H), 7.12 (d, 2H), 6.96 (d, 2H), 6.57 (d, 1H), 4.95 (m, 1H), 4.62 (m, 1H), 4.03 (m, 2H), 3.67 (m, 4H), 3.25 (m, 1H), 2,89 (m, 4H), 2.45 (m, 6H), 2.35 (s, 3H), 1.48 (s, 9H).

¹³C NMR (CDCl₃): δ=170.0, 164.8, 153.7, 150.5, 145.4, 135.3, 132.8, 130.7, 130.4, 127.5, 122.2, 82.9, 56.2, 54.6, 54.5, 53.6, 49.5, 48.6, 46.0, 44.2, 43.7, 41.6, 36.3, 27.9, 21.6.

Example 79 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(1,1-dioxo)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 85 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=4.98, (m, 1H), 4.90 (m, 1H), 4.44 (d, 1H), 4.03 (d, 1H), 3.67 (m, 1H), 3.37 (m, 1H), 3.25-3.02 (m, 1H), 3.20 (s, 3H), 3.11 (s, 3H), 2.68 (m, 1H).

¹³C NMR (CDCl₃): δ=171.7, 167.9, 166.3, 164.4, 157.0, 156.4, 150.5, 139.6, 134.0, 133.1, 131.3, 131.1, 130.9, 121.9, 117.2, 116.9, 64.1, 58.8, 53.7, 50.6, 36.9, 36.5, 35.6.

Example 80 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(isonipecotoyloxy)phenylalanine tert-Butyl Ester

Substituting piperazine for N-methylpiperazine, and following the methods for the preparation of Example 4, gave the title compound as a white solid.

NMR data was as follows:

¹³C NMR (CDCl₃): δ=7.70 (d, 2H), 7.32-7.26 (m, 2H), 7.14 (d, 2H), 7.01 (d, 2H), 4.72-4.68 (m, 1H), 4.07-4.05 (m, 1H), 3.60-3.49 (m, 4H), 3.37-3.31 (m, 1H), 3.22-2.98 (m, 3H), 2.42 (s, 3H), 2.02 (m, 2H), 1.61-1.55 (m, 6H), 1.50-1.45 (m, 13H).

¹³C NMR (CDCl₃): δ=177.3, 170.7, 169.8, 150.6, 144.3, 133.1, 130.1, 129.9, 127.9, 121.6, 110.8, 82.5, 62.2, 57,2, 53.7, 49.5, 44.9, 37.2, 29.7, 27.8, 25.7, 24.1, 21.4.

Example 81 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The product of Example 82 was oxidized by the method of Larsson and Carlson (Acta Chemica Scan. 1994, 4, 517-525), yielding the tide compound as a white solid.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.69 (d, 2H), 7.33-7.29 (m, 3H), 7.20 (d, 2H), 7.00 (d, 2H), 4.71-4.66 (m, 1H), 4.13-4.04 (m, 5H), 3.37-3.32 (m, 1H), 3.21-3.00 (m, 7H), 2.41 (s, 3H), 2.05-2.01 (m, 1H), 1.52-1.44 (m, 12H).

¹³C NMR (CDCl₃): δ=170.7, 169.7, 149.8, 144.3, 134.4, 133.3, 130,6, 130.0, 127.9, 121.4, 82.7, 62.4, 54.0, 52.1, 49.7, 43.2, 37.6, 29.7, 28.1, 24.4, 21.7.

Example 82 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

Substituting thiomorpholine for N-methylpiperazine, and following the methods for the preparation of Example 4, gave the title compound as a white solid.

NMR data was as follows:

¹³C NMR (CDCl₃): δ=7.70 (d, 2H), 7.31-7.26 (m, 2H), 7.16 (d, 2H), 7.00 (d, 2H), 4.72-4.66 (m, 1H), 4.07-4.04 (m, 1H), 3.89-3.79 (m, 4H), 3.37-3.32 (m, 1H), 3.22-2.99 (m, 3H), 2.67 (t, 4H), 2.42 (s, 3H), 2.02 (m, 2H), 1.50-1.45 (m, 12H).

¹³C NMR (CDCl₃): δ=177.2, 170.7, 169.8, 153.5, 150.2, 144.3, 133.6, 132.9, 130.3, 129.9, 127.9, 121.5, 82.5, 62.4, 53.7, 49.5, 47.0, 46.4, 37.2, 29.6, 27.8, 27.3, 24.1, 21.4.

Example 83 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(pyrrolidin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

Substituting pyrrolidinecarbonyl chloride for dimethylcarbamyl chloride, and following the methods for the preparation of Example 2, gave the title compound as a white solid.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.71 (d, 2H), 7.32 (d, 2H), 7.15 (d, 2H), 7.04 (d, 2H), 4.73-4.67 (m, 1H), 4.07-4.04 (m, 1H), 3.53 (t, 2H), 3.45 (t, 2H), 3.36-3.32 (m, 1H), 3.24-2.98 (m, 3H), 2.42 (s, 3H), 2.03-1.88 (m, 5H), 1.75 (s, 1H), 1.52 (1.24 (m, 12H).

¹³C NMR (CDCl₃): δ=170.7, 169.8, 153.1, 150.4, 144.3, 133.1, 130.1, 129.9, 127.9, 121.6, 110.8, 99.8, 82.5, 62.2, 53.7, 49.5, 46.3, 37.2, 29.7, 27.8, 25.6, 24.8, 24.0, 21.4.

Example 84 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedures described for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.87 (m, 2H), 7.28-7.13 (m, 5H), 7.02 (d, 2H), 4.70-4.60 (m, 2H), 4.58 (d, 1H), 4.06 (d, 1H), 3.38-3.01 (m, 3H), 3.09 (s, 3H), 3.00 (s, 3H), 2.58 (m, 1H), 1.47 (s, 9H).

¹³C NMR (CDCl₃): δ=169.7, 167.8, 154.9, 150.7, 132.7, 130.9, 130.7, 130.4, 121.8, 117.1, 116.8, 82.9, 65.1, 53.9, 51.4, 36.8, 36.6, 36.4, 33.1, 27.9.

Example 85 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(1,1-dioxo)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared from the product of Example 84 following the procedure oxidation procedure of Larsson and Carlson (Acta Chemica Scan. 1994, 48, 517-525).

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.90 (m, 2H), 7.30-7.04 (m, 7H), 4.83-4.58 (m, 3H), 3.66 (m, 2H), 3.32-3.24 (m, 1H), 3.09-2.85 (m, 2H), 3.10 (s, 3H), 3.01 (s, 3H), 1.50 (s, 9H).

¹³C NMR (CDCl₃): δ=173.1, 169.8, 168.0, 165.6, 154.9, 150.9, 132.6, 131.1, 131.0, 130.3, 122.3, 117.3, 117.0, 83.2, 62.8, 57.8, 53.9, 49.0, 36.8, 36.6, 36.4, 27.9.

Example 86 Synthesis of N-(2,5-Dichlorothiophene-3-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate stating materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.14 (d, 2H), 7.09 (s, 1H), 7.07 (d, 1H), 7.01 (d, 2H), 4.73-4.66 (m, 1H), 4.32-4.28 (m, 1H), 3.42-3.17 (m, 3H), 3.08 (s, 3H), 3.06-3.01 (m, 1H), 2.98 (s, 3H), 2.17-2.04 (m, 1H), 1.84-1.60 (m, 2H), 1.60-1.46 (m, 1H), 1.45 (s, 9H).

¹³C NMR (CDCl₃): δ=170.2, 169.9, 154.9, 150.6, 133.4, 133.1, 131.2, 130.2, 127.9, 127.0, 121.7, 82.7, 62.2, 53.6, 49.3, 37.2, 36.6, 36.4, 30.1, 27.8, 24.2.

Example 87 Synthesis of N-(4-Acetamidobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=8.58 (s, 1H), 7.70-7.67 (m, 4H), 7.32 (d, 1H), 7.14 (d, 2H), 7.01 (d, 2H), 4.68 (m, 1H), 3.99 (m, 1H), 3.37-3.34 (m, 1H), 3.23-3.16 (m, 1H), 3.11-3.01 (m, 1H), 3.08 (s, 3H), 2.98 (s, 3H), 2.13 (s, 3H), 1.97-1.94 (m, 1H), 1.55-1.47 (m, 3H), 1.44 (s, 9H).

¹³C NMR (CDCl₃): δ=171.1, 169.9, 169.4, 155.0, 150.6, 143.3, 133.3, 130.2, 130.0, 128.9, 121.7, 119.4, 82.7, 62.2, 53.8, 49.6, 37.2, 36.6, 36.4, 29.9, 27.8, 24.4, 24.1.

Example 88 Synthesis of N-(4-tert-Butylbenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 73 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.81 (d, 2H), 7.59 (d, 2H), 7.07 (d, 2H), 6.97 (d, 2H), 6.46 (d, 1H), 4.95 (m, 1H), 4.62 (m, 1H), 4.06 (m, 2H), 3.23 (m, 1H), 3.07 (m, 4H), 2.97 (m, 4H), 2.81 (m, 4H), 1.55 (s, 9H), 1.37 (s, 9H).

¹³C NMR (CDCl₃): δ=170.0, 164.9, 158.2, 154.8, 150.6, 135.0, 132.6, 130.2, 127.4, 126.9, 122.2, 82.7, 56.1, 53.5, 49.7, 48.8, 41.5, 36.5, 36.3, 36.1, 35.2, 30.8, 27.8.

Example 89 Synthesis of N-(Pyridine-3-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 56 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=8.95 (s, 1H), 8.83 (d, 1H), 8.28-8.24 (m, 1H), 7.73-7.69 (m, 1H), 7.30 (d, 2H), 7.05 (d, 2H), 4.68-4.63 (m, 1H), 4.29-4.25 (m, 1H), 3.47-3.41 (m, 1H), 3.38-3.22 (m, 2H), 3.09 (s, 3H), 3.06-3.02 (m, 1H), 2.96 (s, 3H), 1.92-1.66 (m, 4H).

¹³C NMR (CD₃OD): δ=174.2, 173.9, 160.6, 160.0, 156.9, 152.9, 152.0, 147.9, 139.1, 136.9, 135.7, 131.6, 126.5, 123.1, 63.1, 54.8, 50.4, 37.5, 36.8, 36.7, 32.2, 25.5.

Example 90 Synthesis of N-(2-Fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

L-Thiamorpholine-3-carboxylic acid was prepared by the method of Larsson and Carlson (Acta Chemica Scan. 1994, 48, 517-525). N-(2-fluorobenzene-4-sulfonyl)-L-thiamorpholine-3-carboxylic acid was prepared using the procedure described in Method 1. The title compound was prepared according to the procedures set forth above using suitable starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.92 (m, 1H), 7.69 (m, 1H), 7.34 (m, 2H), 7.16 (m, 2H), 6.99 (m, 2H), 6.60 (d, 1H), 5.01 (m, 1H), 4.64 (m, 1H), 4.03 (m, 2H), 3.29 (m, 1H), 3.06 (m, 6H), 2.90 (m, 7H), 1.49 (d, 9H).

¹³C NMR (CDCl₃): δ=169.9, 164.8, 160.3, 156.9, 154.9, 150.7, 136.6, 136.4, 132.7, 131.0, 130.3, 128.8, 126.4, 126.2, 125.1, 122.2, 118.1, 117.8, 82.7, 56.3, 56.7, 50.2, 49.5, 41.8, 36.5, 36.3, 27.8.

Example 91 Synthesis of N-(3-Fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

L-Thiamorpholine-5-carboxylic acid was prepared by the method of Larsson and Carlson (Acta Chemica Scan. 1994, 48, 517-525). N-(3-fluorobenzene-4-sulfonyl)-L-thiamorpholine-5-carboxylic acid was prepared using the procedure described in Method 1. The title compound was prepared according to the procedures set forth above using suitable starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.66 (m, 1H), 7.58 (m, 2H), 7.34 (m, 1H), 7.07 (d, 1H), 6.92 (d, 1H), 6.42 (d, 1H), 5.00 (m, 1H), 4.58 (m, 1H), 4.02 (m, 2H), 3.22 (m, 1H), 3.05 (s, 3H), 2.98 (m, 6H), 1.45 (s, 9H).

¹³C NMR (CDCl₃): δ=170.0, 164.5, 164.4, 161.0, 154.9, 150.6, 140.3, 140.2, 132.5, 131.9, 131.8, 130.2, 123.2, 123.1, 122.2, 121.4, 121.2, 115.0, 114.7, 82.9, 56.1, 53.4, 49.9, 49.1, 41.7, 36.5, 36.3, 36.0, 27.8.

Example 92 Synthesis of N-(2,4-Difluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

L-Thiamorpholine-5-carboxylic acid was prepared by the method of Larsson and Carlson (Acta Chemica Scan. 1994, 48, 517-525). N-(2,4-difluorobenzene-4-sulfonyl)-L-thiamorpholine-5-carboxylic acid was prepared using the procedure described in Method 1. The title compound was prepared according to the procedures set forth above using suitable starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.93 (m, 1H), 7.15 (m, 2H), 7.04 (m, 4H), 6.53 (d, 1H), 4.97 (m, 1H), 4.64 (m, 1H), 4.05 (m, 2H), 3.21 (m, 3H), 3.17 (s, 3H), 2.97 (m, 5H), 1.43 (s, 9H).

¹³C NMR (CDCl₃): δ=170.0, 164.6, 154.9, 150.7, 132.6, 132.6, 130.3, 122.6, 122.1, 112.6, 112.3, 107.0, 106.7, 106.3,.82.8, 56.3, 53.5, 50.5, 49.8, 42.0, 36.5, 36.3, 27.8.

Example 93 Synthesis of N-(4-Acetamidobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 87 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=8.05 (d, 1H), 7.78 (m, 4H), 7.26 (d, 2H), 7.02 (d, 2H), 4.94 (m, 1H), 4.72-4.67 (m, 1H), 4.13-4.09 (m, 1H), 3.40-3.36 (m, 1H), 3.30-3.05 (m, 3H), 3.08 (s, 3H), 2.97 (s, 3H), 2.15 (s, 3H), 1.81-1.51 (m, 4H).

¹³C NMR (CD₃OD): δ=174.3, 174.2, 172.3, 156.9, 152.0, 144.9, 135.5, 132.4, 131.6, 130.2, 122.9, 120.7, 63.2, 54.7, 50.6, 37.5, 36.8, 36.7, 31.7, 25.4, 24.0.

Example 94 Synthesis of N-(4-Trifluoromethoxybenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 72 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=7.93 (d, 2H), 7.48 (d, 2H), 7.28 (d, 2H), 7.03 (d, 2H), 4.72-4.68 (m, 1H), 4.17-4.13 (m, 1H), 3.45-3.42 (m, 1H), 3.28-3.11 (m, 2H), 3.14-3.07 (m, 1H), 3.09 (s, 3H), 2.97 (s, 3H), 1.85-1.69 (m, 3H), 1.59 (m, 1H).

¹³C NMR (CD₃OD): δ=174.2, 174.1, 157.0, 153.9, 152.0, 137.3, 135.6, 131.7, 131.5, 123.0, 122.5, 121.8, 63.1, 54.7, 50.6, 37.4, 36.8, 36.6, 31.9, 25.4.

Example 95 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared using the procedure described in Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.90 (m, 2H), 7.22 (m, 4H), 7.00 (m, 3H), 5.08 (m, 1H), 4.84 (m, 1H), 4.56 (d, 1H), 4.42 (d, 1H), 3.88 (s, 1H), 3.15-2.99 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.26-1.16 (m, 12H).

¹³C NMR (CDCl₃): δ=170.4, 168.2, 167.5, 164.1, 154.9, 150.7, 132.8, 132.2, 132.1, 131.0, 130.8, 130.3, 121.8, 116.9, 116.6, 73.5, 69.6, 54.6, 53.2, 50.5, 37.6, 36.6, 36.3, 29.1, 23.8, 21.6, 21.5.

Example 96 Synthesis of N-(4-Cyanobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 58 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ=8.14 (d, 1H), 7.94-7.89 (m, 4H), 7.29 (d, 2H), 7.03 (d, 2H), 4.70-4.66 (m, 1H), 4.21-4.17 (m, 1H), 3.47-3.40 (m, 1H), 3.31-3.21 (m, 2H), 3.11-3.04 (m, 1H), 3.09 (s, 3H), 2.97 (s, 3H), 1.87-1.72 (m, 3H), 1.70-1.61 (m, 1H).

¹³C NMR (CD₃OD): δ=174.2, 173.9, 157.0, 152.0, 142.9, 135.7, 134.5, 131.7, 129.7, 123.0, 118.6, 111.8, 63.0, 54.7, 50.5, 37.4, 36.8, 36.7, 32.0, 25.4.

Example 97 Synthesis of N-(Toluene-4-sulfonyl)-L-(3,3-dimethyl)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared using the procedure described for the preparation of Example 98.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.76 (d, 1H), 7.75 (d, 1H), 7.35 (d, 1H), 7.34 (d, 1H), 7.33 (d, 1H), 7.20 (d, 1H), 7.10 (d, 1H), 7.03 (d, 1H), 6.91 (d, 0.5H), 6.08 (d, 0.5H), 4.86 (ddd, 0.5H), 4.77 (q, 0.5H), 3.61-3.47 (m, 2H), 3.27-3.02 (m, 3H), 3.09 (s, 3H), 3.00 (s, 3H), 2.45 (s, 1.5H), 2.43 (s, 1.5H), 1.75-1.68 (m, 0.5H), 1.61-1.51 (m, 0.5H), 1.45 (s, 4.5H), 1.40 (s, 4.5H), 1.48-1.25 (m, 3H); 0.95 (s, 1.5H), 0.80 (s, 1.5H); 0.61 (s, 1.5H).

¹³C NMR (CDCl₃): δ=170.4, 170.1, 170.0, 169.6, 155.0, 154.9, 150.7, 150.6, 144.3, 144.2, 133.4, 133.1, 132.8, 132.6, 130.7, 130.2, 129.9, 129.8, 128.0, 121.8, 121.7, 82.6, 82.2, 71.5, 71.2, 53.6, 52.7, 47.3, 47.2, 42.7, 42.5, 38.2, 38.1, 37.7, 37.5, 36.6, 36.3, 27.8, 27.8, 27.2, 23.4, 23.2, 21.5.

Example 98 Synthesis of N-(Toluene-4-sulfonyl)-L-(3,3-dimethyl)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

3,3-Dimethyl proline (see Sharma and Lubell, J. Org. Chem. 1996, 61, 202-209) was N-tosylated using the procedure described in Method 1. The title compound was then prepared following the procedure described for the preparation of Example 2.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.76 (d, 1H), 7.74 (d, 1H), 7.36 (d, 1H), 7.33 (d, 2H), 7.19 (d, 1H), 7.10 (d, 1H), 7.03 (d, 1H), 6.91 (d, 0.5H), 6.89 (d, 0.5H), 5.06 (sept., 0.5H), 4.96 (sept., 0.5H), 4.98-4.83 (m, 1H), 3.59-3.48 (m, 2H), 3.31-3.03 (m, 3H), 3.09 (s, 3H), 3.00 (s, 3H), 2.45 (s, 1.5H), 2.43 (s, 1.5H), 1.75-1.66 (m, 0.5), 1.62-1.52 (m, 0.5H), 1.34-1.22 (m, 3H), 1.27 (s, 1.5H), 1.25 (s, 1.5H), 1.22 (s, 1.5H), 1.20 (s, 1.5H), 0.95 (s, 1.5H), 0.78 (s, 1.5H), 0.60 (s, 1.5H), 0.57 (s, 1.5H).

¹³C NMR (CDCl₃): δ=170.8, 170.6, 170.0, 169.7, 154.9, 150.8, 150.6, 144.4, 144.2, 133.2, 132.5, 132.5, 130.7, 130.2, 129.9, 129.8, 128.0, 122.0, 121.8, 71.5, 17.2, 69.5, 69.3, 53.0, 52.2, 47.3, 47.2, 42.8, 42.5, 38.2, 38.1, 37.6, 37.2, 36.6, 36.3, 27.1, 23.4, 23.2, 21.6, 21.6, 21.5, 21.5.

Other compounds prepared by the methods described above include those set forth in Examples 99-137 in Table II below. In addition, Examples 101, 109, 111, 117, 132 and 137 found in Table II are exemplified as follows:

Example 101 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-4-(N,N-dimethylcarbamyloxy)-L-phenylalanine Isopropyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2.

NMR data was as follows:

¹H NMR (CD₃)₂SO: δ=8.28 (d, 1H), 7.70 (d, 2H), 7.41 (d, 2H), 7.23 (d, 2H), 6.99 (d, 2H), 4.86 (sept, 1H), 4.47 (m, 1H), 4.40 (m, 1H), 4.10 (m, 1H), 4.07 (m, 1H), 3.38 (m, 1H), 3.30 (m, 1H), 3.09 (m, 3H), 2.95 (s, 3H), 3.00 (s, 3H), 2.88 (s, 3H), 2.39 (s, 3H), 1.63 (m, 3H), 1.51 (m, 3H), 1.44 (m, 1H), 1.39 (m, 1H), 1.16 (d, 3H), 1.11 (d, 3H).

¹³C NMR (CD₃)₂SO: δ=171.3, 170.8, 154.2, 150.2, 143.7, 134.1, 130.2, 130, 127.6, 121.6, 68.2, 61.2, 53.5, 49, 36.3, 36.1, 35.7, 30.5, 23.8, 21.4, 21.4, 21.

Example 109 Synthesis of N-(Benzylsulfonyl)-L-(5,5-dimethyl) thiaprolyl-L-(4-N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 111 using the procedure described in Method 11.

Physical data was as follows:

MS (FAB) (M+H)⁺ 550.

Calcd. for: C₂₅H₃₁N₃O₇S₂; C, 54.62; H, 5.68; N, 7.64.

Found: C, 54.51; H, 5.60; N, 7.63.

Example 111 Synthesis of N-(Benzylsulfonyl)-L-(5,5-dimethyl) thiaprolyl-L-(4-N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 2 and by substituting the appropriate starting materials.

Physical data was as follows:

MS [M+H]⁺ 550.

Calcd. for: C₂₉H₃₉N₃O₇S₂; C, 57.52; H, 6.45; N, 6.94.

Found: C, 57.32; H, 6.52; N, 6.81.

Example 117 Synthesis of N-(Methyl-pyrazole-sulfonyl)-L-prolyl-L-(4-N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

Substituting N-methyl-pyrazole sulfonyl chloride (see Dickson, U.S. Pat. No. 3,665,009 (May 23, 1972) and following the method for the preparation of Example 56, gave the title compound.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.83 (s, 1H), 7.76 (s, 1H), 7.26 (m, 1H), 7.15 (m, 2H), 7.00 (m, 2H), 4.69 (m, 1H), 3.95 (m, 1H), 3.93 (s, 3H), 3.38 (m, 1H), 3.23-3.11 (m, 1H), 3.10-2.99 (m, 4H), 2.99 (s, 3H), 2.05 (m, 1H), 1.66-1.46 (m, 3H), 1.44 (s, 9H).

¹³C NMR (CDCl₃): δ 170.7, 169.9, 154.9, 150.6, 138.9, 133.2, 132.5, 130.2, 121.7, 117.9, 82.6, 62.4, 53.7, 49.7, 39.6, 37.7, 36.6, 36.4, 29.9, 27.9, 24.2.

Example 132 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-prolyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)-phenylalanine tert-Butyl Ester

Substituting thiamorpholine for N-methylpiperazine, and following the method for the preparation of Example 4 and 14, gave the title compound.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.87-7.82 (m, 2H), 7.28-7.17 (m, 5H), 7.01 (d, 2H), 4.71-4.69 (m, 1H), 4.14-4.05 (m, 5H), 3.39-3.36 (m, 1H), 3.23-3.01 (m, 7H), 2.05-2.03 (m, 1H), 1.58-1.44 (m, 12H).

¹³C NMR (CDCl₃): δ=170.4, 169.8, 153.0, 149.7, 134.2, 130.6, 130.5, 121.3, 116.8, 116.5, 82.6, 62.1, 53.6, 51.8, 49.5, 43.1, 42.7, 37.2, 29.7, 27.8, 24.2.

Example 137 Synthesis of N-(Methyl-pyrazole-4-sulfonyl)-L-prolyl-L-(4-N,N-dimethylcarbamyloxy)-phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 117.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.83 (s, 1H), 7.76 (s, 1H), 7.27 (d, 1H), 7.13 (d, 2H), 7.01 (d, 2H), 5.06-5.02 (m, 1H), 4.80-4.73 (m, 1H), 3.97-3.94 (m, 1H), 3.93 (s, 3H), 3.44-3.37 (m, 1H), 3.25-3.19 (m, 1H), 3.09-3.00 (m, 5H), 2.97 (s, 3H), 2.06-2.02 (m, 1H), 1.66-1.48 (m, 3H), 1.23 (d, 6H).

¹³C NMR (CDCl₃): δ 170.8, 170.5, 154.9, 150.6, 138.9, 132.9, 32.5, 130.2, 121.7, 117.8, 69.5, 62.3, 53.2, 49.7, 39.6, 37.1, 36.6, 36.3, 29.9, 24.1, 21.6, 21.5.

TABLE II

R¹ R² R³ R₅ R_(6′) Ex. No. p-CH₃-φ- R²R³ cyclic p-[(4-methylpiperazine-1-yl)C(O)O—]benzyl- —O-n-butyl 99 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²R³ cyclic p-[(4-methylpiperazine-1-yl)C(O)O—]benzyl- —O-cyclopentyl 100 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —OCH(CH₃)₂ 101 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²R³ cyclic p-[(piperdidin-4-yl)C(O)O—]benzyl- —OCH₂CH₃ 102 3 carbon atoms (L-pyrrolidinyl) φ-CH₂— R²R³ cyclic p-[(1-methylpiperidine-4-yl)C(O)O—]benzyl- —OCH₂CH₃ 103 3 carbon atoms (L-pyrrolidinyl) φ-CH₂— R²R³ cyclic p-[(4-methylpiperazine-1-yl)C(O)O—]benzyl- —OH 104 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²R³ cyclic p-[(1-Boc-4-phenylpiperidin-4-yl)- —OCH₂CH₃ 105 3 carbon atoms C(O)O—]benzyl- (L-pyrrolidinyl) 1-methylimidazol-4-yl R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —OC(CH₃)₃ 106 3 carbon atoms (L-pyrrolidinyl) p-NH₂-φ- R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —OC(CH₃)₃ 107 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²R³ cyclic p-[(morpholin-4-yl)C(O)O-—]benzyl- —OC(CH₃)₃ 108 3 carbon atoms (L-pyrrolidinyl) φ-CH₂— R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —OH 109 —CH₂—S—C(CH₃)₂— p-CH₃-φ- R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —OH 110 —CH₂CH₂—NH—CH₂— (L-piperizinyl) φ-CH₂— R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —OC(CH₃)₃ 111 —CH₂—S—C(CH₃)₂— p-CH₃-φ- R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —NH-adamantyl 112 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —NHCH₂C(O)OH 113 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²R³ cyclic p-[(CH₃)₂NS(O)₂O—]benzyl- —OCH₃ 114 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ- R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —OC(CH₃)₃ 115 —CH₂CH₂—NH—CH₂— (L-piperizinyl) p-CH₃-φ- R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —OC(CH₃)₃ 116 —CH₂CH₂— (Cbz)NHCH₂— (L-4-N-(Cbz)-piperizinyl] 1-methylpyrazol-4-yl R²R³ cyclic p-[(CH₃(₂NC(O)O—]benzyl- —OC(CH₃)₃ 117 3 carbons atoms (L-pyrrolidinyl) 3-pyridyl R²R³ cyclic p-[(CH₃(₂NC(O)O—]benzyl- —OH 118 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²R³ cyclic p-[(1-Boc-piperazin-4-yl)C(O)O—]benzyl- —OCH₂CH₃ 119 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²R³ cyclic p-[(morpholin-4-yl)C(O)O—]benzyl- —OCH₂CH₃ 120 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ —CH₁₃ H p-[(thiomorpholin-4-yl sulfone)- —OC(CH₁₃)₃ 121 C(O)O—]benzyl- p-CH₃-φ —CH₁₃ H p-[(thiomorpholin-4-yl)C(O)O—]benzyl- —OH 122 p-CH₃-φ R²R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- 2,4-dioxo- 123 3 carbon atoms tetrahydrofuran- (L-pyrrolidinyl) 3-yl(3,4-enol) p-CH₃-φ R²R³ cyclic p-[(piperazin-4-yl)C(O)O—]benzyl- —OH 124 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²R³ cyclic p-[(1-Bpc-piperazin-4-yl)C(O)O—]benzyl- —OC(CH₃)₃ 125 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²R³ cyclic p-[(piperazin-4-yl)C(O)O—]benzyl- —OCH₂CH₃ 126 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²R³ cyclic p-[(4-acetylpiperazin-1-yl)C(O)O—]benzyl— —OCH₂CH₃ 127 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²R³ cyclic p-[(4-methanesulfonylpiperazin- —OCH₂CH₃ 128 3 carbon atoms 1-yl)C(O)O—]benzyl— (L-pyrrolidinyl) p-CH₃-φ R²R³ cyclic 3-nitro-4-[(morpholin-4-yl)-C(O)O—]benzyl- —OH 129 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²R³ cyclic p-[(1-Boc-piperazin-4-yl)C(O)O—]benzyl- —OH 130 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ —CH₃ —C(CH₃)₃ p-[(4-methylpiperazine-1-yl)C(O)O—]benzyl- —OC(CH₃)₃ 131 p-F-φ R²R³ cyclic p-[(1,1-dioxothiomorpholin- —OC(CH₃)₃ 132 3 carbon atoms 4-yl)-C(O)O—]benzyl- (L-pyrrolidinyl) p-F-φ R²R³ cyclic p-[(morpholin-4-yl)C(O)O—]benzyl- —OC(CH₃)₃ 133 3 carbon atoms (L-pyrrolidinyl) p-CH₃-φ R²R³ cyclic p-[(morpholin-4-yl)C(O)O—]benzyl- —OH 134 —CH₂CH₂SO₂CH₂— (L-1,1-dioxothiomorpholin-3-yl) 1-methylpyrazol-4-yl R³ cyclic p-[(methylpiperazin-1-yl)C(O)O—]benzyl- —OC(CH₃)₃ 135 3 carbon atoms (L-pyrrolidinyl) morpholin-4-yl R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —OC(CH₃)₃ 136 3 carbon atoms (L-pyrrolidinyl) 1-methylpyrazol-4-yl R³ cyclic p-[(CH₃)₂NC(O)O—]benzyl- —OC(CH₃)₃ 137 3 carbon atoms (L-pyrrolidinyl)

Additional compounds prepared by the methods described above include the following:

Example 138 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The N-methylpyrazole sulfonyl chloride was prepared by adding N-methylpyrazole to chilled (0° C.) chlorosulfonic acid. The reaction mixture was allowed to warm to room temperature and then heated to 100° C. overnight under a stream of N₂. The reaction mixture was then cooled to room temperature and chilled to 0° C. To this solution was added thionyl chloride (2.5 eq.) and the reaction was stirred at room temperature for 30 min., then warmed to 70° C. for two hours. The reaction was cooled to room temperature and then chilled in an ice bath. Water and ice were slowly added to the reaction mixture to precipitate a white solid which was collected by filtration. The desired sulfonyl chloride was washed with cold water and hexane.

The title compound was then prepared following the procedure outlined for the preparation of Example 2 by substitution of the appropriate starting materials, mp: 169-170° C.

Example 139 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 138 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ=7.94 (s, 1H); 7.79 (s, 1H); 7.25 (d, 2H, J=8.8 Hz); 7.0 (d, 2H, J=8.8 Hz); 5.15 (br s, 1H); 4.80 (m, 1H); 4.54 (d, 1H, J=9.9 Hz); 4.39 (d, 1H, J=9.3 Hz); 3.93 (s, 3H); 3.88 (s, 1H); 3.23-3.02 (m, 2H); 3.07 (s, 3H); 2.98 (s, 3H); 1.27 (s, 3H); 1.14 (s, 3H).

¹³C NMR (CDCl₃): 173.86, 169.05, 155.23, 150.47, 139.21, 133.59, 133.15, 130.53, 121.84, 117.57, 73,58, 54,71, 53.75, 50.42, 39.60, 37.18, 36.60, 36.36, 35.11, 28.97, 23.95.

Example 140 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N-(1,4-dioxa-8-aza-spiro[4.5]decan-8-yl)carbonyloxy)phenylalanine Ethyl Ester

The title compound was prepared following the procedure outlined for Example 4 by substitution of the appropriate starting materials.

Physical data was as follows:

MS (+ESI): 630 [M+H]⁺.

Anal. Calcd. for C₃₁H₃₉N₃O₉S.0.2 CH₂Cl₂: C, 57.94; H, 6.14; N, 6.50.

Found: C, 57.73; H, 5.90; N, 6.47.

Example 141 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4N-(1,4-dioxa-8-aza-spiro[4.5]decan-8-yl)carbonyloxy)phenylalanine

The product of Example 140 was hydrolyzed using the procedure described in Method 5 but employing methanol as the solvent and running the reaction at 25° C. for 24 h. The solvent was then evaporated, the residue taken up in H₂O, washed with methylene chloride and lyophilized to afford the title compound.

Physical data was as follows:

MS (+ESI): 619 [M+H]⁺.

Anal. Calcd. for C₂₉H₃₅N₃O₉SLi.1.5 H₂O: C, 53.37; H, 6.02; N, 6.44.

Found: C, 53.40; H, 5.58; N, 6.48.

Example 142 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-acetylpiperazin-1-ylcarbonyloxy)phenylalanine

The product of Example 127 was hydrolyzed using the procedure described in Method 5 but employing methanol as the solvent and running the reaction at 25° C. for 24 h. The solvent was then evaporated, the residue taken up in H₂O, washed with methylene chloride and lyophilized to afford the title compound.

Physical data was as follows:

MS (+ESI): 587 [M+H]⁺.

Anal. Calcd. for C₂₈H₃₃N₄O₈SLi.3H₂O: C, 52.01; H, 6.08; N, 8.66.

Found: C, 52.03; H, 5.36; N, 8.04.

Example 143 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-methanesulfonylpiperazin-1-ylcarbonyloxy)phenylalanine

The product of Example 128 was hydrolyzed using the procedure described in Example 142.

Physical data was as follows:

MS (+ESI): 623 [M+H]⁺.

Anal. Calcd. for C₂₇H₃₃N₄O₉S₂Li.2 H₂O: C, 48.79; H, 5.61; N, 8.43.

Found: C, 48.66; H, 5.14; N, 8.04.

Example 144 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-phenylpiperazin-1-ylcarbonyloxy)phenylalanine

The ethyl ester of the title compound was prepared following the procedure outlined for Example 4 by substitution of the appropriate starting materials. The ethyl ester was then hydrolyzed using the procedure described in Example 142.

Physical data was as follows:

MS (−ESI): 619 [M−H]⁻.

Anal. Calcd. for C₃₂H₃₆N₄O₇SLi.2H₂O: C, 58.00; H, 5.93; N, 8.45.

Found: C, 57.65; H, 5.49; N, 8.13.

Example 145 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(piperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The product of Example 125 (0.7 g, 1 mmol) was dissolved in methylene chloride (9 mL). The solution was cooled to 0° C. and trifluoroacetic acid (1.0 mL) was added and the resulting clear solution was stirred for 4 h. The reaction solution was then diluted with additional methylene chloride (50 mL), washed with saturated sodium bicarbonate solution (3×50 mL), dried (K₂CO₃) and the solvent stripped off to give a white solid (0.465 g). Flash chromatography (9:1 CH₂Cl₂:EtOH) of this material gave a clear oil which was washed several times with hexane to give a white solid (0.289 g, 48%).

Physical data was as follows:

MS (+ESI): 601.7 [M+1]⁺.

Anal. Calcd. for C₃₀H₄₀N₄O₇S.0.25 CH₂Cl₂: C, 58.42; H, 6.56; N, 9.01.

Found: C, 58.79; H, 6.51; N, 8.74.

Example 146 Synthesis of 2-(Saccharin-2-yl)propionyl-L-4-(4′-methylpiperazin-1-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 46 using the procedure described in Method 11, mp=117-122° C. (with foaming).

Physical data was as follows:

Anal. Calcd. for C₂₅H₂₈N₄O₈S.1.5H₂O: C, 52.53; H, 5.47; N, 9.80.

Found: C, 52.26; H, 5.36; N, 9.23.

Example 147 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-methanesulfonyl piperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for Example 128 by substitution of the appropriate starting materials.

Physical data was as follows:

MS (+ESI): 696 [M+NH₄]⁺.

Anal. Calcd. for C₃₁H₄₂N₄O₉S₂.0.5 CH₂Cl₂: C, 51.62; H, 6.00; N, 7.76.

Found: C, 51.55; H, 6.21; N, 7.60.

Example 148 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine (N′-tert-butoxycarbonyl-2-amino-2-methylpropyl) Ester

(BOC)₂O (96 mg, 0.44 mmol) was added to a solution of the product from Example 9 (200 mg, 0.4 mmol.), N-Boc-2-amino-2-methyl-1-propanol (965 mg, 0.5 mmol) and a catalytic amount of DMAP in THF (92 mL) containing pyridine (50 μl). The mixture was sted at room temperature under argon for 48 h. The mixture was poured into 1N HCl and extracted with ethyl acetate. The organic phase was washed (1N HCl), dried (MgSO₄) and the solvent was removed under reduced pressure. The residue was purified by flash chromatography (EtOAc:hexanes 2:1) to give the desired compound as an amorphous white foam (150 mg., 55%).

Physical data was as follows:

MS: [M+H]⁺ at 675.

MS (+ESI): [M+NH₄]⁺ at 692 (100%).

Example 149 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine 2-(Morpholin-4-yl)ethyl Ester

The title compound was prepared following the procedure outlined for Example 148 by substituting 2-morpholinoethanol for N-Boc-2-amino-2-methyl-1-propanol.

Physical data was as follows:

Anal. Calcd. for C₃₀H₄₀N₄O₈S.0.5 H₂O: C, 57.58; H, 6.60; N, 8.95.

Found: C, 57.26; H, 6.29; N, 8.82.

Example 150 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-acetylpiperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for Example 127 by substitution of the appropriate starting materials.

Physical data was as follows:

MS (+ESI): 660.4 [M+NH₄]⁺.

Anal. Calcd. for C₃₂N₄₂N₄O₈S.0.15 CH₂Cl₂: C, 58.91; H, 6.50; N, 8.55.

Found: C, 58.64; H, 6.36; N, 8.40.

Example 151 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-hydroxypiperidin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for Example 4 by substituting 4-piperidinol for N-methyl piperazine.

Physical data was as follows:

Anal. Calcd. for C₃₁H₄₁N₃O₈S.0.6 H₂O.0.22 EtOAc: C, 59.28; H, 6.86; N, 6.51.

Found: C, 58.92; H, 6.37; N, 6.47.

Example 152 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N-(2′-(morpholin-4′-yl)ethyl)carbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for Example 4 by substituting 4-(2-aminoethyl)morpholine for N-methyl piperazine.

Physical data was as follows:

Anal. Calcd. for C₃₂H₄₄N₄O₈S.0.25 H₂O: C, 59.20; H, 6.91; N, 8.63.

Found: C, 59.01; H, 6.54; N, 8.38.

Example 153 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N-(1,4-dioxa-8-aza-spiro[4.5]decan-8-yl)carbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for Example 4 by substitution of the appropriate starting materials.

Physical data was as follows:

MS (−ESI): 656 [M−H]⁻.

Anal. Calcd. for C₃₃H₄₃N₃O₉S.0.1 CH₂Cl₂: C, 59.67; H, 6.54; N, 6.31.

Found: C, 59.83; H, 6.63; N, 6.66.

Example 154 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N-(2′-hydroxyethyl)-N-methylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for Example 4 by substituting 2-(methylamino)ethanol for N-methyl piperazine.

Physical data was as follows:

Anal. Calcd. for C₂₉H₃₉N₃O₈S.0.5 H₂O: C, 58.18; H, 6.73; N, 7.02.

Found: C, 57.95; H, 6.5; N, 6.9.

Example 155 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-formyloxypiperidin-1-ylcarbonyloxy)phenylalanine

The title compound was prepared by treating the product of Example 151 with formic acid overnight with stirring. The title compound was obtained as a white foam (130 mg., 94%), following removal of excess formic acid.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHZ) δ 12.8 (s, 1H); 8.23 (s, 1H); 8.09 (d, 1H); 7.69 (d, 2H), 7.4 (d, 2H); 7.23 (d, 2H), 7.02 (d, 2H); 5.00 (m, 1H); 4.45 (m, 1H); 4.10 (m, 1H); 3.6-3.8 (br, 2H); 3.4 (br s, 1H); 3.25 (m, 2H); 3.10 (m, 2H); 2.95 (m, 1H); 2.35 (s, 3H); 1.95 (m, 2H); 1.56-1.75 (m, 5H); 1.4 (m, 1H).

IR (KBr, cm⁻¹) 3400, 2950, 1720, 1680, 1510, 1430, 1325, 1250, 1150, 1010, 650, 75, 540.

MS ((+)ESI, m/z (%)) 605 (100 [M+NH, 1⁺).

Anal. Calcd. for C₂₈H₃₃N₃O₉S.0.66H₂O: C, 56.09; H, 5.77; N, 7.01.

Found: C, 56.14; H, 5.83; N, 6.78.

Example 156 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-hydroxypiperidin-1-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure outlined for Example 4 by substitution of the appropriate starting materials, mp. 64-67° C. (with foaming).

Physical data was as follows:

Anal. Calcd. for C₃₀H₃₉N₃O₈S.0.75 H₂O.0.1 EtOAc: C, 58.51; H, 6.67; N, 6.73.

Found: C, 58.55; H, 6.09; N, 6.78.

Example 157 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-(2-hydroxyethyl)piperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The carbonate was prepared by treatment of Tos-Pro-Tyr-t-butyl ester with 4-nitrophenyl chloroformate, followed by addition of N-(2-hydroxyl ethyl)piperazine (triethylamine, methylene chloride, chilled to 0° C., then stirred at room temperature overnight). The crude product was purified by flash chromatography (silica, 95:5 EtOAc:EtOH) to afford a white solid, mp. 158-160° C. (0.387 g, 58%).

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz) δ=8.15 (d, 1H, J=7.90 Hz); 7.70 (d, 2H, J=6.59 Hz); 7.40 (d, 2H, J=7.90 Hz); 7.23 (d, 2H, J=8.56 Hz); 7.00 (d, 2H, J=8.56 Hz); 4.42 (m, 1H); 4.38 (m, 1H); 4.08 (m, 1H); 3.51 (m, 4H); 3.34 (m, 3H); 3.09 (m, 1H); 2.99 (m, 2H); 2.43 (m, 6H); 2.39 (s, 3H); 1.59 (m, 3H); 1.39 (m, 1H); 1.35 (s, 9H).

IR (KBr,cm⁻¹) 3505, 3400, 2990, 2930, 2890, 1730, 1700, 1670, 1510, 1430, 1350, 1220, 1200, 1160, 670, 590, 545.

MS ((−)ESI, m/z (%)) 643 (98 [M−NH₄]).

Anal. Calcd. for C₃₂H₄₄N₄O₈S: C, 59.61; H, 6.88; N, 8.69.

Found: C, 59.06; H, 6.95; N, 8.43.

Example 158 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N-(2′-formyloxyethyl)-N-methylcarbamyloxy)phenylalanine

The title compound was prepared by treating the product of Example 154 with formic acid overnight with stirring. The title compound was obtained as a white foam (110 mg., 77%), following removal of excess formic acid.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz) δ 12.8 (s, 1H); 8.25 (d, 1H); 8.08 (d, 1H); 7.69 (d, 2H), 7.40 (d, 2H); 7.22 (d, 2H), 6.98 (dd, 2H); 4.47 (m, 1H); 4.35 (m, 1H); 4.27 (m, 1H); 4.10 (m, 1H); 3.65 (m, 1H); 3.55 (m, 1H); 2.85-3.15 (overlapping m, 7H); 2.40 (s, 3H); 1.55 (m, 3H); 1.40 (m, 1H).

IR (KBr,cm⁻¹) 3420, 2910, 1725, 1510, 1400, 1340, 1270, 1150, 675, 590, 550.

MS ((+)ESI, m/z (%)) 579 (100 [M+NH,1⁺).

Anal. Calcd. for C₂₆H₃₁N₃O₉S.0.66H₂O: C, 54.45; H, 5.68; N, 7.33

Found: C, 54.41; H, 5.60; N, 7.24.

Example 159 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N-(2′-hydroxyethyl)-N-methylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure outlined for Example 4 by substitution of the appropriate starting materials, mp. 49-52° C.

Physical data was as follows:

Anal Calcd. for C₂₈H₃₇N₃O₈S.0.5 H₂O: C, 57.52; H, 6.55; N, 7.19.

Found: C, 57.56; H, 6.38; N, 7.14.

Example 160 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-4-(N-(methoxycarbonylmethyl)carbamyloxy)phenylalanine tert-Butyl Ester

The carbonate was prepared by treatment of Tos-Pro-Tyr-t-butyl ester with 4-nitrophenyl chloroformate, followed by addition of glycine methyl ester (triethylamine, methylene chloride, chilled to 0°, then stirred at room temperature overnight). The crude product was purified by flash chromatography (silica, 3:2 EtOAc:hexane) to afford a white foam (0.640 g, 35%).

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz) δ 8.15 (d, 1H, J=8.12 Hz); 8.12 (d, 2H, J=6.15 Hz); 7.73 (d, 2H, J=8.34 Hz); 7.40 (d, 2H, J=7.90 Hz); 7.24 (d, 2H, J=8.56 Hz); 6.98 (d, 2H, J=8.34 Hz); 4.25 (m, 1H); 4.07 (m, 1H); 3.83 (d, 2H, J=6.15 Hz); 3.64 (s, 3H); 3.32 (m, 1H); 3.02 (m, 3H); 2.39 (s, 3H); 1.56 (m, 3H); 1.41 (m, 1H); 1.35 (s, 9H).

IR (KBr,CM⁻¹) 3400, 2990, 1745, 1680, 1500, 1370, 1350, 1200, 1160, 670, 600.

MS ((+)ESI, m/z (%)) 621 (100[M+NH₄]⁺).

Anal. Calcd. for C29H₃₇N₃O₉S: c, 57.70; H, 6.18; N, 6.96.

Found: C, 57.63; H, 6.11; N, 6.74.

Example 161 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl) thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure outlined for Example 138 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.91 (s, 1H), 7.81 (s, 1H), 7.21 (d, 2H, J=8.2 Hz), 7.03 (m, 3H); 5.03 (m, 1H), 4.84 (m, 1H), 4.55 (d, 1H), 4.42 (d, 1H), 3.96 (s, 3H), 3.83 (s, 1H), 3.18-3.01 (m, 2H), 3.10 (s, 3H), 3.01 (s, 3H), 1.28 (s, 3H), 1.24 (m, 6H), 1.17 (s, 3H).

¹³C NMR (CDCl₃): δ 170.43, 166.31, 154.92, 150.68, 132.91, 132.88, 130.34, 121.78, 117.69, 73.76, 69.61, 54,79, 53.2, 50.52, 39.61, 37.62, 36.58, 36.35, 28.96, 24.02, 21.57, 21.49.

Example 162 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-methoxypiperidin-1-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure outlined for Example 156 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (DSMO-d₆, 400 MHz) δ 8.10 (d, 1H); 7.72 (d, 2H); 7.41 (d, 2H); 7.24 (d, 2H); 7.02 (d, 2H); 4.92 (m, 1H); 4.45 (m, 1H); 4.10 (m, 1H); 3.8 (br s, 1H); 3.65 (br s, 1H); 3.40 (M, 2H); 3.25 (s, 3H); 2.95-3.15 (overlapping m, 5H); 2.40 (s, 3H); 1.85 (br, 2H); 1.4-1.6 (m, 6H); 1.18 (d, 3H); 1.12 (d, 3H).

IR (KBr,cm⁻¹) 3400, 2950, 1720, 1520, 1425, 1340, 1210, 1160, 1100, 625, 590, 540.

MS ((+) ESI, m/z (%)) 633 [M+NH]⁺).

Example 163 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-methoxypiperidin-1-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 162 using the procedure described in Method 5.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz) δ 12.8 (s, 1H); 8.10 (d, 1H); 7.72 (d, 2H); 7.41 (d, 2H); 7.24 (d, 2H); 7.02 (d, 2H); 4.45 (m, 1H); 4.10 (m, 1H); 3.8 (br s, 1H); 3.65 (br s, 1H); 3.40 (m, 2H); 3.25 (s, 3H); 2.95-3.15 (overlapping m, 5H); 2.40 (s, 3H); 1.85 (br, 2H); 1.4-1.6 (m, 6H).

IR (KBr, cm⁻¹) 3400, 2950, 1720, 1520, 1425, 1340, 1210, 1160, 1100, 625, 590, 540.

MS ((−)ESI, m/z (%)) 572 (100 [M−H]⁻.

Anal. Calcd. for C₂₈H₃₅N₃O₈S.0.33EtOAc.1H₂O: C, 56.73; H, 6.44; N, 6.77.

Found: C, 56.96; H, 6.01; N, 6.76.

Example 164 Synthesis of N-(Toluene-4-sulfonyl)-L-4-oxoprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

Dichloromethane (7 mL) was cooled to −60° C. (chloroform/dry ice bath). Oxalyl chloride (0.15 mL) was added. The product from Example 165 (870 mg) and dry DMSO (0.26 mL) were dissolved in dichloromethane (8 mL) and added slowly to the above solution. The reaction was stirred at −60° C. for 30 minutes under dry conditions. Triethylamine (1.05 mL) was added. After 5 minutes, the dry ice bath was removed. The reaction was stirred at room temperature for 1 hour. The solvent was evaporated in vacuo. Ethyl acetate (30 mL) was added to the residue. The mixture was washed with citric acid solution (5%, 2×30 mL) and saturated NaHCO solution (2×30 mL); and finally with brine. The solution was dried over MgSO₄. The solvent was evaporated in vacuo, and the residue was flushed on a silica gel column to give 440 mg of the desired product, mp: 78-80° C.

Example 165 Synthesis of N-(Toluene-4-sulfonyl)-L-trans-4-hydroxyprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

N-(Toluene-4-sulfonyl)-L-trans-4-hydroxyprolyl-L-4-(hydroxy)phenylalanine tert-butyl ester (1.60 g) and dimethylcarbamyl chloride (0.30 mL) were dissolved in DMF at 0° C. in an ice bath. Potassium carbonate powder (2.03 g) was added to the solution. The ice bath was removed after 5 minutes. The reaction was stirred at room temperature for 6 hours. The solid was filtered. Ethyl acetate (40 mL) was added to the solution. The solution was washed with citric acid solution (5%, 40 mL) 2 times, and saturated NaHCO₃ solution (40 mL) 1 time. The solution was then washed with brine and dried with MgSO₄. The solvent was evaporated in vacuo to give 1.07 g of the title compound, mp: 170-172° C.

Example 166 Synthesis of N-(3-Fluorobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

N-(3-Fluorobenzenesulfonyl)-L-prolyl-L-4-(hydroxy)phenylalanine tert-butyl ester (700 mg) and dimethylcarbamyl chloride (0.2 mL) were dissolved in DMF (15 mL) at 0° C. in an ice bath. Potassium carbonate powder (1.375 g) was added to the solution. The ice bath was removed after 5 minutes. The reaction was stirred at room temperature for 6 hours. The solid was filtered. Ethyl acetate (20 mL) was added to the solution. The solution was washed with citric acid solution (5%, 30 mL, 2×), and saturated NaHCO3 solution. The solution was then washed with brine and dried with MgSO₄. The solvent was evaporated in vacuo to give 890 mg of the title compound, mp: 107-109° C.

Example 167 Synthesis of N-(Morpholino-sulfonyl)-L-prolyl-L-(4-N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

N-(Morpholino-sulfonyl)-L-proline was prepared using the procedure described by Cheeseright, et al., J. Chem. Soc. Perkin Trans. 1 1994, 12, 1595-1600. The title compound was prepared following the procedure described for the preparation of Example 2.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.13 (d, 2H), 7.03 (d, 2H), 6.92 (d, 1H), 4.71 (q, 1H), 4.25 (t, 1H), 3.67 (t, 4H), 3.39 (dt, 1H), 3.28-3.19 (m, 1H), 3.23 (t, 4H), 3.18 (dd, 1H), 3.08 (dd, 1H), 3.09 (s, 3H), 3.00 (s, 3H), 2.16-2.08 (m, 2H), 1.98-1.86 (m, 1H), 1.78-1.66 (m, 1H), 1.45 (s, 9H).

¹³C NMR (CDCl₃): δ 171.2, 170.4, 154.8, 150.7, 132.9, 130.3, 121.7, 82.7, 66.3, 62.6, 53.3, 49.6, 46.2, 37.0, 36.6, 36.3, 30.5, 27.8, 24.7.

Example 168 Synthesis of N-(Morpholino-sulfonyl)-L-prolyl-L-(4-N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 167 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 8.04 (d, 1H), 7.25 (d, 2H), 7.01 (d, 2H), 4.71-4.64 (m, 1H), 4.22 (dd, 1H), 3.62-3.50 (m, 4H), 3.43-3.31 (m, 2H), 3.24 (dd, 1H), 3.11 (t, 4H), 3.09 (s, 3H), 3.03 (dd, 1H), 2.97 (s, 3H), 2.22-2.11 (m, 1H), 1.98-1.80 (m, 3H).

¹³C NMR (CD₃OD): δ 174.65, 174.58, 174.00, 156.60, 151.70, 135.30, 131.20, 122.70, 67.10, 63.10, 54.59, 54.50, 50.6, 47.10, 37.10, 36.50, 36.40, 32.0, 25.60.

Example 169 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedures described for the preparation of Examples 14 and 117.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.93 (s, 1H), 7.80 (s, 1H), 7.12 (d, 2H), 6.98 (d, 2H), 6.44 (d, 1H0HH), 4.95 (m, 1H), 4.66 (m, 1H), 4.04 (m, 2H), 3.98 (s, 3H), 3.19 (m, 2H), 3.06 (m, 6H), 2.98 (m, 4H), 1.42 (m, 9H).

¹³C NMR (CDCl₃): δ 170.58, 164.75, 154.91, 150.75, 139.33, 132.73, 132.43, 130.43, 122.18, 119.66, 83.07, 56.02, 53.23, 50.03, 49.03, 41.49, 39.63, 36.56, 36.31, 36.16, 27.87.

Example 170 Synthesis of N-(2-Fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 90 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 7.90 (m, 1H), 7.72 (m, 1H), 7.56 (d, 1H), 7.37 (m, 2H), 7.20 (d, 2H), 7.07 (d, 2H), 5.18 (m, 1H), 4.59 (m, 1H), 4.26 (m, 1H), 3.76 (m, 2H), 3.36 (m, 1H), 3.21 (m, 2H), 3.08 (m, 6H), 2.96 (s, 3H).

¹³C NMR (CD₃OD): δ 173.85, 168.04, 162.06, 158.69, 156.92, 152.06, 137.69, 135.05, 131.83, 131.59, 129.77, 128.44, 128.26, 126.21, 123.17, 119.04, 118.75, 57.04, 54.99, 52.08, 51.66, 43.36, 37.24, 36.83, 36.66.

Example 171 Synthesis of N-(2,4-Difluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 92 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 8.88 (m, ½H), 8.14 (m, ½H), 7.90 (m, 1H), (m, 1H), 7.20 (m, 2H), 7.10 (m, 1H), 7.03 (m, 2H), 5.16 (m, 1H), 4,63 (m, 1H), 4.28 (m, 1H), 3.75 (m, 2H), 3.41 (m, 1H), 3.15 (m, 5H), 3.02 (m, 4H).

¹³C NMR (CD₃OD): δ 173.91, 168.04, 156.93, 152.05, 135.15, 133.81, 133.67, 131.60, 123.13, 113.48, 113.18, 107.38, 107.02, 57.02, 55.02, 52.29, 51.84, 43.45, 37.34, 36.83, 36.66.

Example 172 Synthesis of N-(Toluene-4-sulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 49 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.67 (d, 2H), 7.32 (d, 2H), 7.21 (d, 2H), 7.10 (d, 1H), 7.00 (d, 2H), 5.40 (bs, >1H), 4.85 (m, 2H), 3.95 (m, 1H), 3.41 (m, 1H), 3.07 (m, 6H), 2.98 (m, 4H), 2.62 (m, 1H), 2.41 (m, 5H), 2.13 (m, 1H).

¹³C NMR (CDCl₃): δ 173.40, 168.49, 155.26, 144.44, 136.88, 132.95, 130.51, 130.30, 127.28, 122.08, 55.34, 53.45, 43.43, 36.62, 36.38, 35.85, 25.25, 24.54, 21.43.

Example 173 Synthesis of N-(Pyridine-3-sulfonyl)-L-(5,5-dimethyl-thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 56 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 9.13 (m, 1H), 8.90 (m, 1H), 8.19 (m, 1H), 7.56 (m, 1H), 7.23 (d, 2H), 7.04 (d, 2H), 6.93 (d, 1H), 5.07 (m, 1H), 4.85 (m, 1H), 4.62 (d, 1H), 4.48 (d, 1H), 3.92 (s, 1H), 3.20-3.05 (m, 2H), 3.12 (s, 3H), 3.03 (s, 3H), 1.32-1.16 (m, 12H).

¹³C NMR (CDCl₃): δ 170.30, 167.75, 154.19, 150.67, 148.59, 135.72, 132.94, 132.72, 130.27, 123.91, 121.78, 73.62, 69.64, 54.69, 53.12, 50.48, 37.50, 36.53, 36.29, 29.05, 23.73, 21.54, 21.46.

Example 174 Synthesis of N-(3-Fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 91 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 7.68 (m, 3H), 7.44 (m, 1H), 7.20 (m, 2H), 7.01 (m, 2H), 5.21 (m, 1H), 4.60 (m, 1H), 4.20 (m, 1H), 3.75 (m, 1H), 3.43 (m, 1H), 3.21 (m, 3H), 3.02 (m, 4H), 2.96 (m, 4H).

¹³C NMR (CD₃OD): δ 173.98, 167.98, 165.89, 162.56, 156.94, 152.06, 142.70, 142.61, 135.11, 133.30, 133.19, 131.57, 124.71, 123.25, 122.21, 121.93, 116.05, 115.71, 57.27, 54.87, 54.79, 51.29, 51.06, 43.24, 37.11, 36.83.

Example 175 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 169 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 8.11 (s, 1H), 7.83 (s, 1H), 7.36 (d, 1H), 7.24 (d, 2H), 7.02 (d, 2H), 5.16 (m, 1H), 4.69 (m, 1H), 4.19 (m, 1H), 3.90 (s, 3H), 3.81 (m, 2H), 3.33 (m, 3H), 3.10 (s, 3H, 3.02 (m, 4H).

¹³C NMR (CD₃OD): δ 174.07, 168.11, 156.93, 152.08, 140.12, 135.05, 134.90, 131.67, 123.28, 121.82, 57.33, 54.77, 50.83, 50.64, 42.94, 39.80, 37.02, 36.84, 36.76.

Example 176 Synthesis of N-(4-tert-Butylbenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 88 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 7.70 (d, 2H), 7.53 (d, 2H), 7.04 (d, 2H), 6.87 (d, 2H), 5.09 (m, 1H), 4.48 (m, 1H), 3.99 (m, 1H), 3.60 (m, 1H), 2.90 (m, 5H), 2.80 (m, 5H), 1.15 (s, 9H).

¹³C NMR (CD₃OD): δ 173.95, 168.09, 159.33, 156.88, 152.09, 137.52, 135.03, 131.54,128.68, 128.15, 123.32, 57.27, 54.81, 50.75, 43.04, 36.97, 36.82, 36.65, 36.16, 31.35.

Example 177 Synthesis of N-(Toluene-4-sulfonyl)-(3,3-dimethyl)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 97 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.77 (d, 1H), 7.75 (d, 1H), 7.42-7.33 (m, 3.5H), 7.27 (d, 1H), 7.19 (d, 0.5H), 7.10 (d, 1H), 7.03 (d, 1H), 5.07-5.00 (m, 0.5H) 4.94-4.87 (m, 0.5), 3.67 (d, 1H), 3.58-3.52 (m, 1H), 3.35-3.25 (m, 1H), 3.19-3.08 (m, 2H), 3.11 (s, 3H), 3.02 (s, 3H), 2.45 (s, 1.5H), 2.43 (s, 1.5H) 1.70-1.57 (m, 1H), 1.34-1.27 (m, 1H), 0.94 (s, 1.5H), 0.75 (s, 1.5H), 0.54 (s 6H).

¹³C NMR (CDCl₃): δ 174.6, 174.4, 171.8, 171.4, 155.7, 150.5, 150.4, 144.5, 144.4, 133.5, 132.6, 130.9, 130.6, 130.0, 129.9, 128.0, 127.9, 122.2, 122.0, 71.2, 70.9, 53.3, 52.2, 47.3, 47.1, 43.0, 42.7, 38.1, 37.9, 36.6, 36.4, 27.0, 26.8, 23.3, 23.0.

Example 178 Synthesis of N-(2,5-Dichlorothiophene-3-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 86 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 8.10 (d, 1H), 7.25 (d, 2H), 7.20 (s, 1H), 7.0 (d, 2H), 4.65 (m, 1H), 4.35 (m, 1H), 3.55-3.35 (m, 2H), 3.30-3.20 (m, 2H), 3.15-3.00 (m, 4H), 2.95 (s, 3H), 2.05-1.80 (m, 2H), 1.80-1.65 (m, 2H).

¹³C NMR (CD₃OD): δ 174.2, 173.9, 156.9, 151.9, 135.9, 135.5, 132.3, 131.6, 128.9, 128.6, 122.9, 63.1, 54.8, 54.7, 50.3, 37.4, 36.8, 36.7, 32.1, 25.5.

Example 179 Synthesis of N-(4-Methoxybenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 180 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CD₃OD): δ 7.78 (d, 2H), 7.27 (d, 2H), 7.09 (d, 2H), 7.02 (d, 2H), 4.71-4.67 (m, 1H), 4.10-4.06 (m, 1H), 3.88 (s, 3H), 3.41-3.31 (m, 1H), 3.28-3.07 (m, 6H), 2.97 (s, 3H), 1.81-1.50 (m, 4H).

¹³C NMR (CD₃OD): δ 168.3, 168.2, 159.2, 150.9, 145.9, 129.5, 125.6, 125.3, 123.5, 116.9, 109.6, 57.2, 50.2, 48.7, 44.6, 31.4, 30.8, 30.6, 25.7, 19.3.

Example 180 Synthesis of N-(4-Methoxybenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared using the procedure described in Example 2 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.76 (d, 2H), 7.34 (d, 1H), 7.14 (d, 2H), 7.03-6.97 (m, 4H), 5.08-5.04 (m, 1H), 4.77 (m, 1H), 4.05-4.03 (m, 1H), 3.86 (s, 3H), 3.37-3.34 (m, 1H), 3.26-3.19 (m, 1H), 3.10-3.01 (m, 4H), 2.98 (s, 3H), 2.02 (m, 1H), 1.56-1.46 (m, 3H), 1.25 (d, 6H).

¹³C NMR (CDCl₃): δ 170.8, 170.3, 163.4, 154.8, 150.5, 132.9, 130.1, 129.9, 127.6, 121.6, 114.3, 69.4, 62.1, 55.4, 53.2, 49.5, 37.1, 36.5, 36.2, 29.7, 24.0, 21.5, 21.4.

Example 181 Synthesis of N-(Toluene-4-sulfonyl)-L-(1-oxo-thiomorpholin-3-carbonyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 182 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 7.90 (m, 1H), 7.78 (m, 2H), 7.40 (m, 2H), 7.26 (m, 2H), 7.03 (m, 2H), 5.14 (m, 1H), 4.64 (m, 2H), 3.81 (m, 1H), 3.71 (m, 2H), 3.19 (m, 1H), 3.14 (m, 3H), 3.02 (m, 4H), 2.84 (m, 1H), 2.60 (m, 1H), 2.42 (m, 4H), 2.21 (m, 1H).

¹³C NMR (CD₃OD): δ 174.22, 173.93, 169.59, 156.88, 152.08, 152.05, 146.44, 146.26, 137.75, 137.63, 135.61, 134.96, 131.79, 131.64, 131.55, 131.39, 128.75, 128.66, 123.35, 123.06, 57.03, 54.88, 54.66, 51.64, 42.69, 42.51, 40.34, 37.12, 36.83, 36.66, 32.76, 21.51.

Example 182 Synthesis of N-(Toluene-4-sulfonyl)-L-(1-oxo-thiomorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 49. The oxidation of the thiomorpholine group to the 1-oxo-thiomorpholine group was per Larsson and Carison (Acta Chemica Scan. 1994, 48, 517-525).

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.72 (m, 2H), 7.69 (m, 2H), 7.31 (m, 2H), 7.11 (m, 2H), 7.07 (m, 2H), 6.96 (m, 2H), 4.79 (m, 1H), 4.54 (m, 1H), 3.80 (m, 4H), 3.04 (4H), 2.92 (m, 3H), 2.64 (m, 1H), 2.43 (m, 4H), 1.44 (s, 3H), 1.36 (s, 6H).

¹³C NMR (CDCl₃): δ 169.8, 166.5, 166.,3 154.6, 150.5, 150.4, 144.9, 144.4, 135.7, 135.3, 132.8, 130.5, 130.1, 29.9, 127.4, 126.9, 122.1, 121.4, 82.6, 82.2, 55.6, 53.9, 53.1, 50.6, 48.1, 47.8, 41.7, 40.5, 38.3, 36.4, 36.1, 31.1, 27.5, 21.2.

Example 183 Synthesis of N-(3,4-Difluorobenzenesulfonyl)-L-prolyl-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.72-7.60 (m, 2H), 7.87-7.37 (m, 1H), 7.13-7.11 (m, 3H), 7.01 (d, 2H), 5.08-5.04 (m, 1H), 4.81-4.74 (m, 1H), 4.09-4.06 (m, 1H), 3.39-3.35 (m, 1H), 3.26-3.19 (m, 1H), 3.12-2.97 (m, 8H), 2.06-2.03 (m, 1H), 1.66-1.57 (m, 3H), 1.26 (d, 6H).

¹³C NMR (CDCl₃): δ 170.50, 170.40, 154.90, 153.60, 150.70, 150.30, 133.30, 132.90, 130.10, 125.00, 121.80, 121.80, 118.50, 112.80, 69.60, 62.20, 53.20, 49.60, 37.10, 36.60, 36.30, 30.10, 24.20, 21.59, 21.56.

Example 184 Synthesis of N-(3,4-Difluorobenzenesulfonyl)-L-prolyl-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 183 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CD₃OD): δ 8.10 (d, 1H), 7.84-7.77 (m, 1H), 7.69-7.65 (m, 1H), 7.53-7.45 (m, 1H), 7.28 (d, 2H), 7.02 (d, 2H), 4.72-4.68 (m, 1H), 4.19-4.16 (m, 1H), 3.43-3.39 (m, 1H), 3.31-3.21 (m, 2H), 3.13-3.05 (m, 4H), 2.97 (s, 3H), 1.86-1.61 (m, 4H).

¹³C NMR (CD₃OD): δ 174.2; 174.1, 164.7, 156.9, 154.9, 152.0, 151.6, 135.8, 135.6, 131.6, 129.7, 122.9, 119.7, 118.8, 63.1, 54.7, 50.5, 37.4, 36.8, 36.6, 31.9, 25.5.

Example 185 Synthesis of N-(3,4-Difluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared using the procedure described in Example 92 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.71 (m, 2H), 7.33 (m, 1H), 7.07 (d, 2H), 6.91 (d, 2H), 6.36 (d, 1H), 4.95 (m, 1H), 4.61 (m, 1H), 4.03 (m, 2H), 3.16 (m, 2H), 3.13 (m, 4H), 3.07 (m, 1H), 2.93 (s, 9H), 1.43 (s, 9H).

¹³C NMR (CDCl₃): δ 170.07, 169.45, 164.42, 155.06, 155.44, 154.81, 152.21, 152.17, 150.58, 148.81, 148.64, 134.90, 134.85, 132.41, 130.29, 124.82, 124.71, 124.66, 121.97, 119.07, 118.76, 117.52, 117.23, 82.92, 55.98, 53.20, 50.10, 49.40, 41.76, 36.41, 36.16, 35.99, 27.64.

Example 186 Synthesis of N-(3,4-Difluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 185 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 6.22 (m, 1H), 6.03 (m, 1H), 5.84 (m, 1H), 5.58 (m, 2H), 5.38 (m, 2H), 3.33 (m, 1H), 3.01 (m, 1H), 2.57 (m, 1H), 2.14 (m, 1H), 1.91 (m, 1H), 1.66 (m, 3H), 1.44 (s, 3H), 1.35 (m, 3H), 1.32 (s, 3H).

¹³C NMR (CD₃OD): δ 173.97, 167.89, 156.94, 153.53, 152.07, 150.00, 137.48, 135.17, 131.63, 126.54, 126.43, 123.20, 120.21, 119.96, 118.84, 118.57, 57.25, 54.82, 51.29, 49.86, 43.29, 37.21, 36.85, 36.67.

Example 187 Synthesis of N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-(thiomorpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared using the procedure described in Example 82 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.64 (d, 2H), 7.33 (d, 2H), 7.25 (d, 2H), 7.08-6.97 (m, 3H), 4.76 (m, 1H), 4.57 (d, 1H), 4.38 (d, 1H), 3.83 (s, 1H), 3.95-3.78 (m, 4H), 3.09 (m, 2H), 2.69 (m, 4H), 2.43 (s, 3H), 1.44 (s, 9H), 1.16 (s, 3H), 1.08 (s, 3H).

¹³C NMR (CDCl₃): δ 169.78, 168.36, 153.53, 150.28, 144.84, 133.53, 132.76, 130.51, 130.03, 128.19, 121.58, 82.69, 73.42, 54.56, 53.78, 50.46, 47.05, 46.40, 37.80, 29.06, 27.76, 27.37, 27.04, 23.86, 21.52.

Example 188 Synthesis of N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-(thiomorpholin-4-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Examples 187 using the procedures described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.77 (d, 2H), 7.37 (d, 2H), 7.28 (d, 2H), 7.22 (d, 1H), 7.03 (d, 2H), 5.35 (brs, 1H), 4.91 (m, 1H), 4.60 (d, 1H), 4.39 (d, 1H), 3.91 (s, 1H), 3.96-3.28 (m, 4H), 3.30-3.07 (m, 2H), 2.67 (m, 4H), 2.45 (s, 3H), 1.10 (s, 3H), 1.08 (s, 3H).

¹³C NMR (CDCl₃): δ 173.09, 169.45, 153.81, 150.28, 145.02, 133.42, 132.61, 130.60, 130.12, 128.13, 121.86, 73.28, 54.51, 53.31, 50.48, 47.08, 46.47, 36.97, 28.97, 27.35, 27.03, 23.70, 21.52.

Example 189 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Ethyl Ester

The title compound was prepared following the procedure described for the preparation of Example 117 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.89 (s, 1H), 7.81 (s, 1H), 7.19 (d, 2H), 7.00 (m, 3H), 4.87 (m, 1H), 4.54 (d, 1H), 4.42 (d, 1H), 4.18 (q, 2H), 3.95 (s, 3H), 3.81 (s, 1H), 3.11 (m, 2H), 3.08 (s, 3H), 2.99 (s, 3H), 1.30 (s, 3H), 1.25 (t, 3H), 1.16 (s, 3H).

¹³C NMR (CDCl₃): δ 170.98, 168.34, 154.91, 150.71, 139.62, 132.88, 130.28, 121.85, 117.71, 73.77, 61.66, 54.80, 53.16, 50.53, 39.64, 37.63, 36.60, 36.36, 28.98, 24.00, 13.92.

Example 190 Synthesis of N-(Pyridine-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 191 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ 9.09 (s, 1H), 8.82 (m, 1H), 8.20 (m, 1H), 7.56 (m, 1H),7.23 (d, 2H), 7.07 (d, 1H), 5.58 (brs, 1H), 4.83 (m, 1H), 4.56 (m, 2H), 4.07 (s, 1H), 3.14 (m, 2H), 3.07 (s, 3H), 2.99 (s, 3H), 1.26 (s, 3H), 1.18 (s, 3H).

¹³C NMR (CDCl₃): δ 173.04, 168.29, 155.16, 153.39, 150.60, 147.96, 136.43, 133.91, 133.06, 130.66, 130.50, 124.65, 122.14, 121.91, 73.43, 54.58, 53.21, 50.38, 37.18, 36.64, 36.38, 29.25, 23.64.

Example 191 Synthesis of N-(Pyridine-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 56 and substitution of appropriate starting materials.

Physical data was as follows:

MS: [M+H]⁺ 593

Anal. Calcd. for C₂₇H₃₆N₄O₇S₂.0.5 H₂O: C, 53.88; H, 6.07; N, 9.27.

Found: C, 53.98; H, 6.07; N, 9.27.

Example 192 Synthesis of N-(Pyridine-2-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

Substituting 2-pyridinesulfonyl chloride (see Corey, et al. J. Org. Chem. 1989, 54, 389-393) and following the method for the preparation of Example 56, gave the title compound.

NMR data was as follows:

¹H NMR (CDCl₃): δ 8.59 (d, 1H), 8.00-7.89 (m, 2H), 7.78 (d, 1H), 7.53-7.49 (m, 1H), 7.16 (d, 2H), 7.01 (d, 2H), 5.05-4.99 (m, 1H), 4.85-4.78 (m, 1H), 4.60-4.57 (m, 1H), 3.44-3.35 (m, 2H), 3.25-3.19 (m, 1H), 3.07 (s, 3H), 3.06-3.01 (m, 1H), 2.97 (s, 3H), 2.19-2.13 (m, 1H), 1.88-1.71 (m, 2H), 1.55 (m, 1H), 1.22-1.19 (m, 6H).

¹³C NMR (CDCl₃): δ 170.90, 170.30, 156.20, 154.80, 150.50, 150.00, 138.00, 133.10, 130.10, 127.00, 123.40, 121.60, 69.20, 62.80, 53.30, 49.60, 37.20, 36.40, 36.20, 29.80, 24.30, 21.42, 21.40.

Example 193 Synthesis of N-(Pyridine-2-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 192 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CD₃OD): δ 8.67 (d, 1H), 8.27 (d, 1H), 8.07-8.02 (m, 1H), 7.96-7.91 (m, 1H), 7.65-7.61 (m, 1H), 7.27 (d, 2H), 7.01 (d, 2H), 4.72-4.69 (m, 1H), 4.58-4.54 (m, 1H), 3.44-3.37 (m, 2H), 3.28-3.24 (m, 1H), 3.13-3.05 (m, 4H), 2.96 (s, 3H), 1.94-1.89 (m, 2H), 1.70-1.63 (m, 2H).

¹³C NMR (CD₃OD): δ 174.5, 174.4, 174.2, 157.7, 156.9, 151.9, 139.9, 135.6, 131.6, 128.8, 124.7, 122.9, 64.1, 54.8, 54.7, 50.9, 37.5, 36.8, 36.7, 31.9, 25.6.

Example 194 Synthesis of N-(Pyridine-2-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 192 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 8.64-8.62 (m, 1H), 7.98-7.92 (m, 2H), 7.56-7.51 (m, 1H), 7.28-7.21 (m, 3H), 7.01 (d, 2H), 5.01-4.97 (m, 1H), 4.88-4.85 (m, 2H), 4.80 (d, 1H), 4.63 (d, 1H), 4.19 (s, 1H), 3.11-3.07 (m, 5H), 2.98 (s, 3H), 1.28 (s, 3H), 1.26-1.18 (m, 9H).

¹³C NMR (CDCl₃): δ 170.3, 168.4, 155.5, 154.9, 150.7, 150.4, 138.2, 133.0, 130.4, 127.5, 123.5, 121.8, 73.5, 69.5, 54.7, 53.3, 51.0, 37.6, 36.6, 36.4, 29.3, 23.9, 21.52, 21.50.

Example 195 Synthesis of N-(Pyridine-2-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 194 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CD₃OD): δ 8.70-8.69 (m, 1H), 8.07-8.01 (m, 1H), 7.92-7.89 (m, 1H), 7.67-7.63 (m, 1H), 4.77-4.67 (m, 3H), 4.30 (s, 1H), 3.23-3.06 (m, 5H), 2.97 (s, 3H), 1.27-1.18 (m, 6H).

¹³C NMR(CD₃OD): δ 174.1, 171.2, 157.0, 151.9, 151.6, 139.9, 135.7, 131.8, 131.7, 129.0, 124.6, 122.9, 74.3, 61.6, 55.7, 54.9, 51.9, 37.6, 36.8, 36.7, 30.1, 24.9.

Example 196 Synthesis of N-(Toluene-4-sulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 49 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.67 (d, 2H), 7.30 (d, 2H), 7.12 (d, 2H), 6.97 (d, 2H), 6.86 (d, 1H), 5.05 (m, 1H), 4.70 (m, 2H), 3.90 (m, 1H), 3.31 (m, 1H), 3.06 (m, 4H), 2.97 (s, 3H), 2.68 (m, 1H), 2.50 (m, 1H), 2.44 (s, 3H), 2.29 (m, 1H), 2.13 (m, 1H), 1.24 (s, 3H), 1.22 (s, 3H).

¹³C NMR (CDCl₃): δ 170.35, 167.55, 155.00, 150.61, 144.20, 136.80, 132.51, 130.24, 130.14, 127.20, 121.82, 69.48, 55.14, 53.55, 43.26, 36.43, 36.16, 25.21, 24.56, 21.48, 21.31.

Example 197 Synthesis of N-(3-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.68 (d, 1H), 7.61-7.52 (m, 2H), 7.36 (dt, 1H), 7.21 (d, 2H), 7.02 (d, 2H), 6.94 (d, 1H), 5.05 (sept, 1H), 4.85 (q, 1H), 4.59 (d, 1H), 4.41 (d, 1H), 3.88 (s, 1H), 3.17-3.03 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.25 (d, 3H), 1.23 (d, 3H), 1.16 (s, 3H), 1.12 (s, 3H).

¹³C NMR (CDCl₃): δ 170;3, 168.1, 162.6, 154.9, 150.7, 137.9, 132.8, 131.3, 130.4, 123.9, 121.8, 121.0, 115.4, 73.5, 69.6, 54.5, 53.2, 50.5, 37.6, 36.6, 36.3, 29.0, 23.7, 21.6, 21.5.

Example 198 Synthesis of N-(2-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.92-7.87 (m, 1H), 7.67-7.59 (m, 1H), 7.33-7.24 (m, 2H), 7.21 (d, 2H), 7.03 (d, 2H), 6.93 (d, 1H), 5.03 (Sept, 1H), 4.83 (q, 1H), 4.67 (d, 1H), 4.63 (d, 1H), 4.03 (s, 1H), 3.16-3.03 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.31 (s, 3H), 1.24 (d, 3H), 1.22 (d, 3H), 1.19 (s, 3H).

¹³C NMR (CDCl₃): δ 170.3, 168.1, 159.2, 154.9, 150.7, 136.0, 132.9, 132.0, 130.3, 124.6, 121.8, 117.6, 73.3, 69.6, 54.8, 53.2, 50.3, 37.6, 36.6, 36.3, 29.1, 23.9, 21.6, 21.5.

Example 199 Synthesis of N-(3,4-Difluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.77-7.71 (m, 1H), 7.70-7.65 (m, 1H), 7.40-7.31 (m, 1H), 7.20 (d, 2H), 7.02 (d, 2H), 6.87 (d, 1H), 5.05 (Sept, 1H), 4.88-4.82 (m, 1H), 4.55 (d, 1H), 4.44 (d, 1H), 3.91 (s, 1H), 3.17-3.03 (m, 2H), 3.09 (s 3H), 3.00 (s, 3H), 1.25 (d, 3H), 1.23 (d, 3H), 1.23 (s, 3H), 1.18 (s, 3H).

¹³C NMR (CDCl₃): δ 170.4, 167.9, 154.9, 150.7, 133.1, 132.7, 130.4, 124.4, 121.8, 118.5, 118.0, 73.6, 69.7, 54.6, 53.1, 50.5, 37.6, 36.6, 36.3, 29.2, 23.7, 21.6, 21.5.

Example 200 Synthesis of N-(3,5-Difluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.77-7.71 (m, 1H), 7.70-7.65 (m, 1H), 7.40-7.31 (m, 1H), 7.20 (d, 2H), 7.02 (d, 2H), 6.87 (d, 1H), 5.05 (Sept, 1H), 4.88-4.82 (m, 1H), 4.55 (d, 1H), 4.44 (d, 1H), 3.91 (s, 1H), 3.17-3.03 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.25 (d, 3H), 1.23 (d, 3H), 1.23 (s, 3H), 1.18 (s, 3H).

¹³C NMR (CDCl₃): δ 170.4, 167.9, 154.9, 150.7, 133.1, 132.7, 130.4, 124.4, 121.8, 118.5, 118.0, 73.6, 69.7, 54.6, 53.1, 50.5, 37.6, 36.6, 36.3, 29.2, 23.7, 21.6, 21.5.

Example 201 Synthesis of N-(2,4-Difluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.94-7.86 (m, 1H), 7.20 (d, 2H), 7.03 (d, 2H), 7.02-6.95 (m, 2H), 6.88 (d, 1H), 5.03 (Sept, 1H), 4.82 (q, 1H), 4.67 (d, 1H), 4.61 (d, 1H), 4.01 (s, 1H), 3.16-3.03 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.36 (s, 3H), 1.23 (d, 3H), 1.21 (d, 3H), 1.20 (s, 3H).

¹³C NMR (CDCl₃): δ 170.3, 167.9, 154.9, 150.7, 133.7, 132.8, 130.3, 121.8, 112.1, 106.1, 73.4, 69.6, 54.9, 53.2, 50.4, 37.6, 36.6, 36.3, 29.1, 23.9, 21.6, 21.5.

Example 202 Synthesis of N-(4-Chlorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.82 (d, 2H), 7.53 (d, 2H), 7.21 (d, 2H), 7.02 (d, 2H), 6.93 (d, 1H), 5.05 (Sept, 1H), 4.89-4.82 (m, 1H), 4.55 (d, 1H), 4.41 (d, 1H), 3.87 (s, 1H), 3.17-3.03 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.25 (d, 3H), 1.23 (d, 3H), 1.16 (s, 6H).

¹³C NMR (CDCl₃): δ 170.3, 168.1, 154.9, 150.7, 140.4, 134.5, 132.8, 130.4, 129.7, 129.5, 121.8, 73.5, 69.6, 54.6, 53.1, 50.5, 37.6, 36.6, 36.3, 29.1, 23.8, 21.6, 21.0.

Example 203 Synthesis of N-(3-Chlorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.88 (t, 1H), 7.78-7.75 (m, 1H), 7.64-7.61 (m, 1H), 7.51 (t, 1H), 7.21 (d, 2H), 7.02 (d, 2H), 6.92 (d, 1H), 5.05 (sept, 1H), 4.89-4.82 (m, 1H), 4.58 (d, 1H), 4.40 (d, 1H), 3.88 (s, 1H), 3.18-3.03 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.25 (d, 3H), 1.23 (d, 3H), 1.16 (s, 3H), 1.14 (s

¹³C NMR (CDCl₃): δ 170.3, 168.0, 154.9, 150.7, 137.7, 135.7, 133.9, 132.8, 130.7, 130.3, 127.9, 126.2, 121.8, 73.6, 69.96, 54.5, 53.2, 50.5, 37.6, 36.6, 36.3, 29.1, 23.7, 21.6, 21.5.

Example 204 Synthesis of N-(2-Chlorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 8.08 (dd, 1H), 7.54-7.52 (m, 2H), 7.45-7.39 (m, 1H), 7.19 (d, 2H), 7.02 (d, 2H), 6.79 (d, 1H), 5.00 (sept, 1H), 4.78 (d, 1H), 4.75-4.68 (m, 1H), 4.69 (d, 1H), 4.19 (s, 1H), 3.09 (s, 3H), 3.06 (d, 2H), 3.00 (s, 3H), 1.38 (s, 3H), 1.23 (s, 3H), 1.23 (d, 3H), 1.19 (d, 3H).

¹³C NMR (CDCl₃): δ 170.3, 168.1, 154.9, 150.7, 135.6, 134.4, 132.8, 132.7, 132.4, 130.3, 127.3, 121.8, 73.3, 69.5, 54.7, 53.3, 50.4, 37.6, 36.6, 36.3, 29.6, 23.7, 21.6, 21.5.

Example 205 Synthesis of N-(3,4-Dichlorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate staring material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.97 (d, 1H), 7.70 (dd, 1H), 7.63 (d, 1H), 7.20 (d, 2H), 7.02 (d, 2H), 6.86 (d, 1H), 5.05 (sept, 1H), 4.89-4.82 (m, 1H), 4.55 (d, 1H), 4.43 (d, 1H), 3.92 (s, 1H), 3.17-3.03 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.26 (d, 3H), 1.22 (d, 3H), 1.23 (s, 3H), 1.18 (s, 3H).

¹³ C NMR (CDCl₃): δ 170.3, 167.9, 154.9, 150.7, 138.7, 136.1, 134.2, 132.7, 131.4, 130.3, 129.8, 127.1, 121.8, 73.6, 69.7, 54.6, 53.1, 50.5, 37.5, 36.6, 36.3, 29.2, 23.7, 21.6, 21.5.

Example 206 Synthesis of N-(3,5-Dichlorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.76 (d, 2H), 7.62 (t, 1H), 7.20 (d, 2H), 7.03 (d, 2H), 6.85 (d, 1H), 5.05 (sept, 1H), 4.89-4.82 (m, 1H), 4.57 (d, 1H), 4.42 (d, 1H), 3.92 (s, 1H), 3.18-3.04 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.25 (d, 3H), 1.23 (d, 3H), 1.27 (s, 3H), 1.18 (s, 3H).

¹³C NMR (CDCl₃): δ 170.3, 167.8, 154.9, 150.7, 139.1, 136.5, 133.7, 132.7, 130.3, 126.2, 121.8, 73.7, 69.7, 54.6, 53.1, 50.5, 37.5, 36.6, 36.3, 29.2, 23.7, 21.6, 21.5.

Example 207 Synthesis of N-(3-Chlorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared using the procedure described in Example 92 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.85 (m, 1H), 7.76 (m, 1H), 7.63 (m, 1H), 7.53 (m, 1H), 7.06 (d, 2H), 6.96 (d, 2H), 6.37 (m, 1H), 5.01 (m, 1H), 4.62 (m, 1H), 4.01 (m, 2H), 3.26 (m, 1H), 3.06 (s, 3H), 2.96 (m, 7H), 1.49 (s, 9H).

¹³C NMR (CDCl₃): δ 170.0, 164.5, 154.9, 150.6, 140.0, 136.1, 134.2, 132.5, 131.3, 130.2, 127.4, 125.5, 122.2, 82.8, 56.0, 53.3, 49.9, 49.2, 41.7, 36.5, 36.3, 36.0, 27.8.

Example 208 Synthesis of N-(3,4-Dichlorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared using the procedure described in Example 92 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.91 (m, 1H), 7.66 (m, 2H), 7.06 (d, 2H), 6.94 (d, 2H), 6.33 (m, 1H), 4.98 (m, 1H), 4.60 (m, 1H), 3.49 (m, 3H), 3.12 (m, 2H), 3.04 (s, 3H), 3.00 (m, 2H), 2.94 (s, 3H), 1.44 (s, 9H).

¹³C NMR (CDCl₃): δ 170.0, 164.3, 154.8, 150.6, 138.8, 137.9, 134.3, 132.4 132.0, 130.3, 129.2, 126.4, 122.1, 83.0, 55.5, 53.1, 50.2, 49.5, 41.8, 36.5, 36.2, 36.0, 27.7.

Example 209 Synthesis of N-(4-Methoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.81 (d, 2H), 7.22 (d, 2H), 7.06-6.99 (m, 5H), 5.04 (sept, 1H), 4.89-4.82 (m, 1H), 4.56 (d, 1H), 4.39 (d), 3.88 (s, 3H), 3.83 (s, 1H), 3.17-3.03 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.25 (d, 3H), 1.22 (d, 3H), 1.15 (s, 3H), 1.12 (s, 3H).

¹³C NMR (CDCl₃): δ 170.3, 168.5, 163.8, 154.9, 150.7, 132.9, 130.4, 130.3, 127.4, 121.7, 114.5, 73.5, 69.5, 55.6, 54.6, 53.2, 50.5, 37.7, 36.6, 36.3, 29.1, 23.9, 21.6, 21.5.

Example 210 Synthesis of N-(3-Methoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.47-7.45 (m, 2H), 7.37-7.36 (m, 1H), 7.21 (d, 2H), 7.19-7.15 (m, 1H), 7.04-6.98 (m, 3H), 5.04 (sept, 1H), 4.88-4.82 (m, 1H), 4.58 (d, 1H), 4.40 (d, 1H), 3.89 (s, 1H), 3.87 (s, 3H), 3.17-3.03 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.25 (d, 3H), 1.23 (d, 3H), 1.15 (s, 3H), 1.08 (s, 3H).

¹³C NMR (CDCl₃): δ 170.3, 168.3, 160.2, 154.9, 150.7, 136.9, 132.9, 130.5, 130.4, 121.7, 120.2, 120.0, 112.6, 73.4, 69.6, 55.7, 54.5, 53.2, 50.4, 37.7, 36.6, 36.3, 29.1, 23.7, 21.6, 21.5.

Example 211 Synthesis of N-(2-Methoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.92 (dd, 1H), 7.54 (dd, 1H), 7.21 (d, 2H), 7.07-7.00 (m, 4H), 6.96 (d, 1H), 5.01 (sept, 1H), 4.83-4.76 (m, 1H), 4.73 (d, 1H) 4.61 (d, 1H), 4.17 (s, 1H), 3.93 (s, 3H), 3.14-3.03 (m, 2H), 3.09 (s, 3H), 3.00 (s, 3H), 1.36 (s, 3H), 1.22 (d, 3H), 1.21 (s, 3H), 1.19 (d, 3H).

¹³C NMR (CDCl₃): δ 170.3, 168.7, 157.7, 154.9, 150.6, 135.4, 133.0, 132.5, 130.3, 125.2, 121.7, 120.5, 112.6, 73.3, 69.5, 56.0, 54.8, 53.3, 50.4, 37.7, 36.6, 36.3, 29.2, 24.1, 21.6, 21.5.

Example 212 Synthesis of N-(3,4-Dimethoxybenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.50 (dd, 1H), 7.31 (d, 1H), 7.21 (d, 2H), 7.05-7.01 (m, 3H), 6.97 (d, 1H), 5.04 (sept, 1H), 4.89-4.82 (m, 1H), 4.56 (d, 1H), 4.40 (d, 1H), 3.95 (s, 3H), 3.94 (s, 3H), 3.89 (s, 1H), 3.17-3.03 (m, 2H), 3.09 (s 3H), 3.00 (s, 3H), 1.25 (d, 3H), 1.22 (d, 3H), 1.16 (s, 3H), 1.14 (s, 3H).

¹³C NMR (CDCl₃): δ 170.3, 168.5, 154.9, 153.5, 150.7, 149.4, 132.9, 130.4, 127.6, 122.3, 121.7, 110.6, 110.3, 73.5, 69.6, 56.3, 56.1, 54.6, 53.2, 50.5, 37.7, 36.6, 36.3, 29.2, 23.8, 21.6, 21.5.

Example 213 Synthesis of N-(2,4-Difluorobenzenesulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 49 by substitution of the appropriate starting material.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.89 (m, 1H), 7.16 (m, 2H), 6.97 (m, 4H), 6.77 (d, 1H), 4.72 (m, 1H), 4.60 (m, 1H), 3.92 (m, 1H), 3.29 (m, 1H), 3.09 (m, 5H), 2.93 (s, 3H), 2.70 (m, 2H), 2.55 (m, 1H), 2.10 (m, 1H), 1.42 (s, 9H).

¹³C NMR (CDCl₃): δ 170.0, 168.0, 167.7, 137.1, 164.4, 164.3, 161.1, 160.9, 157.7, 157.5, 154.8, 150.5, 132.7, 132.6, 132.4, 130.4, 124.0, 123.8, 121.7, 112.2, 111.9, 106.5, 106.1, 105.8, 82.6, 55.4, 53.9, 43.5, 36.4, 36.2, 27.7, 26.8, 25.5.

Example 214 Synthesis of N-(3,4-Dichlorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 208 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 8.04 (m, 1H), 7.68 (m, 2H), 7.52 (m, 1H), 7.21 (d, 2H), 7.02 (d, 2H), 5.22 (m, 1H), 4.63 (m, 1H), 4.22 (m, 1H), 3.71 (m, 1H), 3.57 (m, 1H), 3.30 (m, 3H), 3.08 (s, 3H), 3.02 (m, 3H), 2.97 (s, 3H).

¹³C NMR (CD₃OD): δ 174.0, 168.0, 156.9, 152.1, 140.7, 139.3, 135.2, 133.2, 131.6, 130.7, 128.3, 123.2, 57.2, 54.9, 54.6, 51.7, 51.4, 43.3, 37.3, 36.9, 36.7.

Example 215 Synthesis of N-(3-Chlorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 207 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CD₃OD): δ 7.94 (m, 1H), 7.77 (m, 2H), 7.58 (m, 1H), 7.46 (d, 1H), 7.19 (d, 2H), 7.07 (d, 2H), 5.23 (m, 1H), 4.63 (m, 1H), 4.20 (m, 1H), 3.71 (m, 1H), 3.43 (m, 1H), 3.26 (m, 4H), 3.17 (s, 3H), 2.95 (m, 5H).

¹³C NMR (CD₃OD): δ 168.0, 152.1, 142.5, 136.8, 135.0, 132.7, 131.6, 128.6, 127.1, 123.3, 57.2, 54.9, 51.4, 51.2, 43.2, 37.2, 36.8, 36.7.

Example 216 Synthesis of N-(3-Chloro-4-fluorobenzenesulfonyl)-L-(1,1-dioxothiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamytoxy)phenylalanine tert-Butyl Ester

The title compound was prepared using the procedure described in Example 92 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CD₃OD): δ 7.93 (d), 7.90 (m), 7.29 (s), 7.27 (d), 7.04 (d), 4.60 (m), 4.46 (d), 3.90-3.40 (m), 3.10 (s), 2.98 (s), 1.43 (s).

¹³C NMR (CD₃OD): δ 171.5, 166.5, 156.9, 151.9, 135.2, 131.3, 129.9, 127.9, 127.8, 123.1, 117.8, 117.5, 101.4, 83.7, 57.9, 56.0, 42.9, 37.3, 36.9, 36.7, 28.1.

Example 217 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedures described for the preparation of Examples 49 and 117.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.77 (s), 7.63 (s), 7.08 (d), 6.93 (d), 6.76 (d), 6.71 (d), 5.50 (d), 5.22 (s), 4.82 (t), 4.61 (q), 3.83 (s), 3.25 (dt), 3.04 (m), 2.90 (s), 2.05 (dd), 1.34 (s).

¹³C NMR (CDCl₃): δ 169.3, 166.8, 154.7, 150.4, 138.4, 132.4, 132.2, 130.2, 121.4, 118.3, 105.4, 82.5, 55.2, 53.6, 53.3, 39.5, 38.3, 36.6, 36.3, 36.1, 27.6, 23.5.

Example 218 Synthesis of N-(3,4-Difluorobenzenesulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Examples 49 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CD₃OD): δ 7.88 (m, 1H), 7.70 (m, 1H), 7.57 (m, 1H), 7.23 (d, 2H), 7.03 (d, 2H), 6.83 (d, 1H), 5.63 (dd, 1H), 5.07 (t, 1H), 4.58 (m, 1H), 3.22-3.00 (m, 3H), 3.09 (s, 3H), 2.98 (s, 3H), 2.07 (dd, 1H), 1.44 (s, 9H).

¹³C NMR (CD₃OD): δ 171.3, 169.3, 156.9, 152.0, 135.0, 131.6, 126.5, 122.9, 120.2, 119.9, 119.4, 118.7, 118.4, 106.4, 83.6, 56.5, 55.6, 37.1, 36.8, 36.6, 28.1, 25.2.

Example 219 Synthesis of N-(Toluene-4-sulfonyl)-L-4-(5,5-dimethyl)thioprolyl-L-(thiomorpholin-4-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared using the procedure described in Example 82 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 9.09 (s, 1H), 8.88 (m, 1H), 8.16 (m, 1H), 7.50 (m, 1H), 7.22 (d, 2H), 7.01 (d, 2H), 6.91 (d, 1H), 5.05 (m, 1H), 4.85 (m, 1H), 4.60 (d, 1H), 4.46 (d, 1H), 3.89 (s, 1H), 3.93-3.83 (m, 4H), 3.11 (m, 2H), 2.69 (m, 4H), 1.29-1.16 (m, 12H).

¹³C NMR (CDCl₃): δ 170.3, 167.8, 154.3, 153.5, 150.4, 148.7, 135.8, 133.1, 132.9, 130.4, 124.0, 121.8, 73.7, 69.7, 54.7, 53.2, 50.5, 47.1, 46.4, 37.6, 29.1, 27.4, 27.0, 23.8, 21.6, 21.5.

Example 220 Synthesis of N-(3,4-Difluorobenzenesulfonyl)-L-(thiamorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 218 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.89 (s, 1H), 7.57-7.46 (m, 2H), 7.35 (d, 1H), 7.32-7.22 (m, 1H), 7.09 (d, 2H), 6.91 (d, 2H),6.64 (d, 1H), 5.50 (d, 1H), 4.89 (s, 1H), 4.88-4.79 (m, 1H), 3.17-3.02 (m, 3H), 3.02 (s, 3H), 2.93 (s, 3H), 1.75 (dd, 1H).

¹³C NMR (CDCl₃): δ 173.6, 167.7, 155.5, 152.0, 151.8, 150.1, 148.4, 132.8, 130.4, 124.6, 121.5, 118.7, 118.5, 117.5, 117.3, 117.1, 106.9, 54.9, 53.0, 36.4, 36.2, 36.0, 23.4.

Example 221 Synthesis of N-(2,5-Dichlorothiophene-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.18 (d, 2H), 7.11 (s, 1H), 7.00 (d, 2H), 6.87 (d, 1H), 5.03-4.99 (m, 1H), 4.84-4.81 (m, 1H), 4.65-4.56 (m, 2H), 4.07 (s, 1H), 3.10-3.01 (m, 5H), 2.98 (s, 3H), 1.37 (s, 3H), 1.22 (s, 3H), 1.21 (s, 3H), 1.18 (s, 3H).

¹³C NMR (CDCl₃): δ 170.3, 167.7, 154.9, 150.7, 132.9, 132.8, 131.9, 130.3, 128.0, 127.0, 121.8, 73.4, 69.6, 54.8, 53.2, 50.5, 37.5, 36.6, 36.3, 29.1, 23.8, 21.6, 21.5.

Example 222 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared using the procedure described in Example 82 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR(CDCl₃): δ 7.89 (s, 1H), 7.80 (s, 1H), 7.21 (d, 2H), 7.01 (m, 3H), 5.03 (m, 1H), 4.83 (m, 1H), 4.54 (d, 1H), 4.40 (d, 1H), 3.95 (s, 3H), 3.86 (m, 4H), 3.80 (s, 1H), 3.09 (m, 2H), 2.68 (m, 4H), 1.28 (s, 3H), 1.22 (m, 6H), 1.16 (s, 3H).

¹³C NMR (CDCl₃): δ 170.4, 168.3, 153.5, 150.4, 139.3, 133.3, 132.9, 130.4, 121.7, 117.6, 73.8, 69.7, 54.8, 53.2, 50.5, 47.1, 46.4 39.6, 37.6, 29.0, 27.4, 27.1, 24.0, 21.6, 21.5.

Example 223 Synthesis of N-(8-Quinolinesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 9.01-8.99 (m, 1H), 8.56-8.53 (m, 1H), 8.27-8.23 (m, 1H), 8.07-8.04 (m, 1H), 7.66-7.61 (m, 2H), 7.55-7.51 (m, 1H), 7.17 (d, 2H), 7.01 (d, 2H), 5.27-5.23 (m, 1H), 5.07-4.98 (m, 1H), 4.84-4.76 (m, 1H), 3.34-3.20 (m, 3H), 3.06-2.98 (m, 4H), 2.97 (s, 3H), 2.15-2.09 (m, 1H), 1.64-1.51 (m, 3H), 1.23 (d, 6H).

¹³C NMR (CDCl₃): δ 172.0, 170.5, 154.9, 151.5, 150.6, 143.9, 136.8, 135.6, 134.9, 134.1, 133.3, 130.2, 129.2, 125.6, 122.3, 121.7, 69.3, 62.8, 53.5, 48.7, 37.3, 36.5, 36.3, 29.7, 24.3, 21.6, 21.6.

Example 224 Synthesis of N-(8-Quinolinesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 223 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CD₃OD): δ 9.03-9.01 (m, 1H), 8.49-8.42 (m, 2H), 8.23-8.20 (m, 1H), 8.09-8.07 (m, 1H), 7.73-7.61 (m, 2H), 7.25 (d, 2H), 7.00 (d, 2H), 5.30-5.27 (m, 1H), 4.73-4.69 (m, 1H), 3.38-3.21 (m, 3H), 3.09-3.02 (m, 4H), 2.95 (s, 3H), 1.86 (m, 1H), 1.78-1.73 (m, 1H), 1.58-1.50 (m, 2H).

¹³C NMR (CD₃OD): δ 175.3, 174.2, 164.7, 156.9, 152.9, 145.2, 138.5, 136.9, 135.8, 135.6, 131.6, 130.9, 126.9, 123.8, 122.9, 63.9, 54.7, 50.0, 37.5, 36.8, 36.7, 31.6, 25.5.

Example 225 Synthesis of N-(8-Quinolinesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N-dimethylcarbamyloxy)phenylalanine Isoproplyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 by substitution of the appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 9.05-9.03 (m, 1H), 8.53-8.49 (m, 1H), 8.26-8.22 (m, 1H), 8.08-8.05 (m, 1H), 7.65-7.60 (m, 1H), 7.56-7.52 (m, 1H), 7.19 (d, 2H), 7.06 (d, 1H), 7.00 (d, 2H), 5.17 (d, 1H), 4.94 (m, 1H), 7.74-4.78 (m, 2H), 4.66 (s, 1H), 3.08-2.99 (m, 8H), 1.20-1.16 (m, 12H).

¹³C NMR (CDCl₃): δ 170.2, 168.9, 154.9, 151.5, 150.6, 144.2, 136.7, 134.4, 134.4, 133.1, 130.3, 129.2, 125.5, 122.3, 121.7, 73.2, 69.3, 54.8, 53.3, 50.6, 37.6, 36.6, 36.3, 29.2, 24.1, 21.5, 21.4.

Example 226 Synthesis of N-(8-Quinolinesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 225 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CD₃OD): δ 9.06-9.04 (m, 1H), 8.45-8.39 (m, 2H), 8.23-8.14 (m, 1H), 7.72-7.61 (m, 2H), 7.32 (d, 2H), 7.03 (d, 2H), 5.12 (d, 1H), 4.87 (d, 1H), 4.69-4.64 (m, 2H), 3.28-3.02 (m, 5H), 2.98 (s, 2H), 1.18 (s, 3H), 1.08 (s, 3H).

¹³C NMR (CD₃OD): δ 174.1, 171.8, 157.1, 152.9, 152.0, 145.5, 138.4, 137.3, 135.8, 135.6, 135.1, 131.8, 130.9, 126.8, 123.8, 122.9, 73.7, 55.9, 54.8, 51.7, 37.6, 36.8, 36.7, 30.2, 25.0.

Example 227 Synthesis of N-(3-Sulfonamido-4-chloro-benzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 8.45 (d, 1H), 7.91 (d, 1H), 7.67 (d, 1H), 7.13 (d, 2H), 7.06 (d, 1H), 7.01 (d, 2H), 5.90 (brs, 2H), 5.06-5.02 (m, 1H), 4.79-4.72 (m, 1H), 4.14-4.10 (m, 1H), 3.42-3.39 (m, 1H), 3.25-3.14 (m, 2H), 3.07 (s, 3H), 3.04-2.97 (m, 1H), 2.96 (s, 3H), 1.98-1.96 (m, 1H), 1.72-1.62 (m, 3H), 1.28-1.25 (m, 6H).

¹³C NMR (CDCl₃): δ 170.8, 170.7, 155.1, 150.6, 141.4, 136.9, 136.1, 132.9, 132.8, 131.9, 130.3, 128.7, 121.9, 69.8, 62.1, 53.3, 49.6, 36.9, 36.6, 36.4, 30.4, 24.3, 21.6, 21.6.

Example 228 Synthesis of N-(Toluene-4-sulfonyl)-L-(1-oxothiomorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 182 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.77 (d, 2H), 7.72 (d, 2H, 7.33 (m, 2H), 7.20 (m, 2H), 7.12 (d, 2H), 7.01 (m, 2H), 5.10 (m, 1H), 5.01 (m, 1H), 4.84 (m, 1H), 4.75 (m, 1H), 3.80 (m, 3H), 3.05 (m, 4H), 2.96 (m, 3H), 2.74 (m, 1H), 2.42 (m, 4H), 1.30-1.20 (m, 6H).

¹³C NMR (CDCl₃): δ 170.6, 170.4, 166.8, 166.7, 154.9, 150.7, 150.6, 145.1, 144.8, 135.8, 135.5, 132.7, 130.6, 130.4, 130.3, 130.0, 127.7, 127.1, 122.4, 121.8, 69.8, 69.4, 55.8, 53.7, 52.9, 50.8, 48.2, 47.9, 42.0, 41.2, 38.4, 36.6, 36.5, 36.3, 31.2, 21.5, 21.5.

Example 229 Synthesis of N-(2,4-Difluorobenzenesulfonyl)-L-(1-oxothiomorpholin-3-carbonyl)-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 182 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.91 (m, 1H), 7.30 (m, 2H), 6.97 (m, 4H), 4.71 (m, 1H), 4.55 (m, 1H), 3.90 (m, 2H), 3.77 (m, 1H), 3.11 (m, 4H), 2.85 (m, 3H), 2.80 (m, 1H), 2.60 (m, 2H), 1.46 (s, 9H), 1.39 (s, 9H).

¹³C NMR (CDCl₃): δ 170.0, 168.0, 167.9, 166.4, 166.2, 164.6, 164.4, 162.7, 161.4, 161.2, 157.9, 157.8, 154.8, 150.6, 150.4, 132.8, 132.5, 132.4, 130.9, 130.4, 130.1, 123.3, 123.1, 122.2, 121.6, 121.1, 122.6, 122.2, 111.9, 106.6, 106.3, 105.9, 82.8, 82.3, 55.8, 54.1, 53.2, 51.6, 49.2, 48.7, 43.1, 42.3, 38.7, 36.5, 36.2, 31.8, 27.7.

Example 230 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine 2,2-Dimethylpropyl Ester

The product from Example 161 (1 g., 0.72 mmol) was dissolved in neopentyl alcohol (5 mL). Titanium (IV) isopropoxide (260 mg., 0.9 mmol) was added and the mixture heated at 100° C. under an inert atmosphere for 48 h. Excess neopentyl alcohol was removed under reduced pressure and the residue purified by flash column chromatography (silica, 1% MeOH in CHCl₃) to give the title compound as a white solid (1.02 g, 97%).

Physical data was as follows:

MS (+) ESI [M+H]⁺ 610; [M+NH4]⁺ 627 (100%).

Anal. Calcd. For C₂₉H₃₉N₅O₇S: C, 53.18; H, 6.45; N, 11.49.

Found: C, 53.46; H, 6.38; N, 11.06.

Example 231 Synthesis of N-(Pryridine-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine 2,2-Dimethylpropyl Ester

The product from Example 173 was subjected to the transesterification procedure described for the preparation of Example 230. The compound was purified by flash column chromatography (silica, 1% MeOH in CHCl₃) followed by recrystallization from ethyl acetate to give the title compound as a white solid (720 mg, 47%).

Physical data was as follows:

Anal. Calcd. For C₂₈H₃₈N₄O₇S₂: C, 55.43; H, 6.31; N, 9.23.

Found: C, 55.37; H, 6.32; N, 9.22.

Example 232 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Cyclopropylmethyl Ester

The product from Example 161 was subjected to the transesterification procedure described for the preparation of Example 230. The title compound was obtained as a white solid following flash column chromatography (silica, 1% MeOH in CHCl₃) (860 mg, 70%).

Physical data was as follows:

Anal. Calcd. For C₂₆H₃₅N₅O₇S₂: C, 52.6; H, 5.94; N, 11.8.

Found: C, 52.49; H, 5.93; N, 11.62.

Example 233 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Methyl Ester

The title compound was prepared following the procedure described for the preparation of Example 161 and substitution of appropriate starting materials.

Physical data was as follows:

MS (+) ESI [M+H]⁺ 554; [M+NH₄]⁺ 571 (100%).

Anal. Calcd. For C₂₃H₃₁N₅O₇S₂.0.2 EtOAc: C, 50.04; H, 5.75; N, 12.26.

Found: C, 50.12; H, 5.69; N, 12.19.

Example 234 Synthesis of N-(Pyridine-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Ethyl Ester

The product from Example 173 was subjected to the transesterification procedure described for the preparation of Example 230. The compound was purified by flash column chromatography (silica, 2% MeOH in CHCl₃), followed by recrystallization from ethyl acetate to give the title compound as a white solid (1.2 g, 61%).

Physical data was as follows:

Anal. Calcd. For C₂₅H₃₂N₄O₇S₂: C, 53.18; H, 5.71; N, 9.92.

Found: C, 53.14; H, 5.72; N, 9.57.

Example 235 Synthesis of N-(Pyridine-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Cyclopropylmethyl Ester

The product from Example 173 was subjected to the transesterification procedure described for the preparation of Example 230. The compound was isolated as a white solid following flash column chromatography (silica, 2% MeOH in CHCl₃) and recrystallization from EtOAc:hexanes (1 g, 65%).

Physical data was as follows:

Anal. Calcd. For C₂₇H₃₄N₄O₄S₂: C, 54.9; H, 5.8; N, 9.48.

Found: C, 54.77; H, 5.65; N, 9.46.

Example 236 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine 2-Methoxyphenyl Ester

To a solution of the compound from Example 139 (1.79 g, 3.31 mmol), 2-methoxy-phenol (0.45 g, 3.64 mmol) and BOP (1.61 g, 3.64 mmol) in methylene chloride (25 mL) at 0° C. was added triethylamine (0.7 mL, 4.97 mmol). The reaction mixture was then slowly warmed to 25° C. where it was stirred, under nitrogen, for 24 h. The reaction was quenched by addition, of 100 mL saturated brine and extracted with EtOAc. The organic extract was washed sequentially with 2N HCl (3 times), saturated sodium bicarbonate (3×) and saturated brine (2×), dried over MgSO₄, and evaporated to 2.1 g of crude product. Flash chromatography (eluant: 96-4 methylene chloride:EtOAc) afforded 1.85 g of a white solid which upon trituration with hexane gave 1.68 g (79%) of white crystals, mp 72-75° C.

Physical data was as follows:

Anal. Calcd. For C₂₉H₃₅N₅O₈S₂: C, 59.94; H, 5.46; N, 10.85.

Found: C, 53.45; H, 5.62; N, 10.31.

Example 237 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine n-Butyl Ester

A solution of the compound of Example 139 (2 g) in n-butanol (50 mL) was saturated upon ice-cooling with HCl gas. The mixture was stirred at ambient temperature for 36 h, evaporated in vacuo to almost dryness, then partitioned between 5% NaHCO₃ and chloroform. The organic layer was dried and evaporated in vacuo to furnish 900 mg of the title compound.

Physical data was as follows:

MS: [(+)ESI], [M+H]⁺ 596.

Example 238 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine n-Propyl Ester

A solution of N-(1-methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine (2 g) in n-propanol (50 mL) was saturated upon ice-cooling with HCl gas. The mixture was stirred at ambient temperature for 36 hours, evaporated in vacuo to almost dryness, then partioned between 5% NaHCO₃ and chloroform. The organic layer was dried and evaporated in vacuo to provide 1500 mg of the title compound.

Physical data was as follows:

MS: [(+)ESI], [M+H]⁺ 582.

Example 239 Synthesis of N-(1-Methylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine 2,2-Dimethylpropionyloxymethyl Ester

Potassium iodide (324 mg) was added at once to a mixture of the compound of Example 139 (1.08 g), chloromethylpivalate (294 mg) and powdered K₂CO₃ (222 mg) in DMF (5 mL). The reaction mixture was stirred at ambient temperature overnight, partitioned between water (12 mL) and ethyl acetate (60 mL). The separated organic layer was washed with ice cold 0.1 N sodium thiosulfate, water and brine, then dried over MgSO₄, filtered and evaporated in vacuo to yield 750 mg of the title compound.

Physical data was as follows:

MS: [(+)ESI], [M+H]⁺ 654.

Example 240 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-phenylpiperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for Example 4 by substitution of the appropriate starting materials. A white solid was obtained, mp. 60-65° C.

Physical data was as follows:

MS (+ESI) 694.3 [M+NH₄]⁺.

Anal. Calcd for C₃₆H₄₄N₄O₇S.0.5C₄H₈O₂: C, 63,31; H, 6.71; N, 7.77.

Found: C, 63.12; H, 6.58; N, 7.69.

Example 241 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4′-(ethoxycarbonyl)piperidin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The carbamate was prepared by treatment of Tos-Pro-Tyr-t-butyl ester with 4-nitrophenylchloroformate, followed by addition of ethylisonipecotate (triethylamine, methylene chloride, chilled to 0° C., then stirred at room temperature overnight). The crude product was purified by flash chromatography (silica, 95:5 EtoAc:Et₃N) to afford a white solid. (0.78 g, 39%).

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 8.15 (d, 1H, J=7.68 Hz); 7.70 (d, 2H, J=8.34 Hz); 7.40 (d, 2H, J=7.90 Hz); 7.22 (d, 2H, J=8.56 Hz); 7.00 (d, 2H, J=8.56 Hz); 4.37 (m, 1H), 4.07 (q, 2H, J=7.14, 14.08 Hz); 4.03 (m, 2H); 3.90 (m, 1H); 3.34 (m, 1H); 3.09 (m, 2H); 3.00 (m, 3H); 2.59 (m, 1H); 2.39 (s, 3H); 1.87 (m, 2H); 1.58 (m, 5H); 1.41 (m, 1H); 1.35 (s, 9H); 1.18 (t, 3H, 7.14 Hz)

IR (KBr, cm⁻¹): 3410, 2990, 2950, 1725, 1680, 1510, 1430, 1355, 1220, 1200, 1170, 1000, 675, 595.

MS ((+)ESI, m/z (%)) 689 (100[M+NH₄]⁺); 691 (37[M+NH₄]⁺).

Anal. Calc'd for C₃₄H₄₅N₃O₉S: C, 60.79; H, 6.75; N, 6.25.

Found: C, 60.59; H, 6.67; N, 6.22.

Example 242 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N-(4′-(2′-aminoethyl)morpholino)carbamyloxy)phenylalanine

The title compound was prepared from the product of Example 152 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 12.75 (s, 1H); 8.08 (d, 1H); 7.68 (d, 2H); 7.60 (t, 1H); 7.39 (d, 2H); 7.21 (d, 2H); 6.97 (d, 2H); 4.46 (m, 1H); 4.08 (m, 1H); 3.56 (m, 4H); 3.26 (m, 3H); 3.09 (m, 2H); 2.94 (m, 1H); 2.49 (s, 6H); 2.48 (s, 3H); 1.5 (m, 3H); 1.38 (m, 1H).

IR (KBr, cm⁻¹) 3400, 2975, 1725, 1650, 1500, 1350, 1150, 650, 575, 550.

MS ((−)ESI, m/z (%)) 587 (100[M−H]⁺).

Anal. Calc'd for C₂₈H₃₆N₄O₈S.HCOOH.0.5H₂O: C, 54.11; H, 6.11; N, 8.70.

Found: C, 53.96; H, 6.02; N, 8.68.

Example 243 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-[4-(carboxy)piperidin-1-ylcarbonyloxy]phenylalanine

The title compound was prepared from the product of Example 241 using the procedures described in Methods 6 and 11.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 12.50 (bs, 2H); 8.08 (d, 1H, J=7.90 Hz); 7.69 (d, 2H, J=8.34 Hz); 7.39 (d, 2H, J=7.90 Hz); 7.22 (D, 2H, J=8.56 Hz); 6.99 (d, 2H, J=8.56 Hz); 4.46 (m, 1H); 4.09 (m, 1H); 4.00 (m, 1H); 3.90 (m, 1H); 3.30 (m, 1H); 3.09 (m, 3H); 2.95 (m, 2H); 2.49 (m, 1H); 2.38 (s, 3H); 1.86 (m, 2H); 1.36-1.61 (m, 6H).

IR (KBr, cm⁻¹) 3400, 2960, 1720, 1535, 1430, 1350, 1200, 1160, 670, 590, 550.

MS ((+)ESI, m/z (%)) 605 (100[M+NH₄]⁺).

Anal. Calc'd for C₂₈H₃₃N₃O₉S H₂O: C, 55.53; H, 5.65; N, 6.94.

Found: C, 55.23; H, 5.82; N, 6.59.

Example 244 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N,N-bis-(2-hydroxyethyl)carbamyloxy)phenylalanine Isopropyl Ester

The carbamate was prepared by treatment of Tos-Pro-Tyr-iPr ester with 4-nitrophenyl chloroformate, followed by addition of diethanol amine (triethylamine, methylene chloride, chilled to 0° C., stirred at room temperature overnight). The chloride product was purified by flash chromatography (silica, 98:2 EtOAc:EtOH) to afford a white foam. (0.180 g, 28%).

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 8.26 (d, 1H, J=7.90 Hz); 7.69 (d, 2H, J=8.12 Hz); 7.40 (d, 2H, J=8.12 Hz); 7.23 (D, 2H, J=8.56 Hz); 6.99 (d, 2H, J=8.56 Hz); 4.87 (m, 1H); 4.83 (t, 1H, J=5.49 Hz); 4.76 (t, 1H, J=5.49 Hz); 4.42 (m, 1H); 4.08 (m, 1H); 3.58 (m, 2H); 3.51 (m, 2H); 3.44 (m, 2H); 3.34 (m, 3H); 2.99-3.09 (m, 3H); 2.39 (s, 3H); 1.59 (m, 3H); 1.41 (m, 1H); 1.16 (d, 3H, J=6.15 Hz); 1.12 (d, 3H, J=6.15 Hz).

IR (KBr, cm⁻¹) 3420, 2940, 1725, 1535, 1670, 1520, 1460, 1410, 1350, 1220, 1160, 1110, 670, 600, 550.

MS ((+)ESI, m/z (%)) 606 (15[M+H]⁺); 623 (100[M+NH₂]⁺).

Anal. Calc'd for C₂₉H₃₉N₃O₉S H₂O: C, 56.66; H, 6.56; N, 6.84.

Found: C, 56.66; H, 6.41; N, 6.72.

Example 245 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-[3-(hydroxymethyl)piperidin-1-ylcarbonyloxy]phenylalanine Isopropyl Ester

The carbamate was prepared by treatment of Tos-Pro-Tyr-iPr ester with 4-nitrophenyl chloroformate, followed by addition of 3-piperidine methanol (triethylamine, methylene chloride, chilled to 0° C., stirred at room temperature overnight). The crude product was purified by flash chromatography (silica, 3:2 EtOAc:Hex) to afford a white foam (0.519 g, 67%).

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 8.26 (d, 1H, J=7.90 Hz); 7.69 (d, 2H, J=8.12 Hz); 7.40 (d, 2H, J=8.12 Hz); 7.22 (d, 2H, J=8.56 Hz); 6.98 (d, 2H, J=8.34 Hz); 4.85 (M, 1H); 4.57 (bs, 1H); 4.42 (m, 1H); 3.99-4.09 (m, 3H); 3.85 (m, 1H); 3.31 (m, 1H); 3.22 (m, 1H); 2.91-3.10 (m, 4H); 2.80 (m, 1H); 2.55 (m, 1H); 2.39 (s, 3H); 1.51-1.72 (m, 6H); 1.42 (m, 2H); 1.16 (d, 3H, J=6.15 Hz); 1.11 (d, 3H), J=6.15 Hz).

IR (KBr, cm⁻¹) 3400, 2990, 2940, 2880, 1725, 1520, 1430, 1350, 1220, 1165, 1100, 660, 600, 550.

MS ((−)ESI, m/z (%)) 614 (30[M−H]).

Anal. Calc'd for C₃₁H₄₁N₃O₈S: C, 60.47; H, 6.71; N, 6.82.

Found: C, 59.83; H, 6.61; N, 6.59.

Example 246 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-trifuoromethanesulfonylpiperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure outlined for Example 128 and substitution of appropriate staring materials.

Physical data was as follows:

MS (+ESI):733 [M+H]⁺.

Anal. Calc'd for C₃₁H₃₉F₃N₄O₉S₂.0.10 C4H8O2: C, 50.20; H, 5.40; 7.55.

Found: C, 50.25; H, 5.46; N, 7.07.

Example 247 Synthesis of N-(4-(N-Phenylurea)benzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

A mixture of Example 107 (250 mg, 0.51 mmol), phenyl isocyanate (62 mg, 0.56 mmol) and triethylamine (76 μL, 0.56 mmol) was heated to reflux under argon. Reflux was continued overnight. Solvent was removed under reduced pressure and the residue purified by flash chromatography. (silica, hexanes: EtOAc 1:1 then EtOAc) to give the title compound as an off-white foam (160 mg, 46%), mp 112-115° C.

Physical data was as follows:

MS (+ESI) [M+NH₄]⁺ 697 (100%).

Example 248 Synthesis of N-(2-Trifluoroacetyl-1,2,3,4-tetrahydroisoquinolin-7-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.70-7.66 (m, 2H), 7.35-7.30 (m, 1H), 7.27-7.21 (m, 1H), 7.14-7.10 (m, 2H), 7.01 (d, 2H), 5.09-4.95 (m, 1H), 4.89-4.75 (m, 2H), 4.14-4.07 (m, 1H), 3.93-3.85 (m, 2H), 3.35-3.20 (m, 2H), 3.13-2.97 (m, 9H), 2.05-2.01 (m, 1H), 1.63 (1.50 (m, 3H), 1.20 (d, 6H).

¹³C NMR (CDCl₃): δ 170.7, 170.6, 170.5, 156.3, 155.8, 154.9, 150.6, 140.1, 139.2, 135.1, 135.1, 13.2, 133.0, 133.0, 132.9, 130.2, 130.1, 129.9, 126.9, 126.4, 126.3, 125.8, 121.7, 118.3, 114.5, 69.6, 62.1, 62.0, 53.2, 49.6, 46.6, 46.5, 45.1, 42.7, 40.9, 37.1, 36.6, 36.3, 30.1, 30.0, 29.2, 27.8, 24.2, 24.2, 21.6, 21.6.

Example 249 Synthesis of N-(1-Methylpyrazole-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

Substituting N-methylpyrazole-3-sulfonyl chloride (See European Patent Application, 095925) and following the method for the preparation of Example 56, gave the title compound.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.45 (d, 1H), 7.21 (d, 2H), 7.09 (d, 1H), 7.01 (d, 2H), 6.71 (d, 1H), 5.03-4.98 (m, 1H), 4.87-4.84 (m, 1H), 4.60-4.59 (m, 2H), 4.05 (s, 1H), 3.97 (s, 3H), 3.12-3.01 (m, 5H), 2.98 (s, 3H), 1.22-1.15 (m, 12H).

¹³C NMR (CDCl₃): δ 170.3, 168.3, 154.9, 150.7, 146.7, 133.0, 131.9, 130.3, 121.7, 108.9, 73.5, 69.5, 54.7, 53.3, 50.7, 39.9, 37.7, 36.6, 36.3, 28.8, 24.1, 21.5, 21.5.

Example 250 Synthesis of N-(1-Methylpyrazole-3-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 249 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CD₃OD): δ 8.25 (d, 1H), 7.76 (d, 1H), 7.32 (d, 2H), 7.01 (d, 2H), 6.70 (d, 1H), 4.74-4.71 (m, 1H), 4.68 (d, 1H), 4.56 (d, 1H), 4.12 (s, 1H), 3.97 (s, 3H), 3.24-3.07 (m, 5H), 2.97 (s, 3H), 1.14 (s, 3H), 1.13 (s, 3H).

¹³C NMR (CD₃OD): δ 174.1, 171.4, 157.0, 151.9, 148.2, 135.7, 134.2, 131.8, 122.9, 109.6, 74.4, 55.6, 55.0, 51.5, 40.0, 37.6, 36.8, 36.7, 29.6, 24.8.

Example 251 Synthesis of N-(Pyridine-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure outlined for the preparation of Example 56, where 4-pyridinesulfonyl chloride N-oxide was used in place of 3-pyridinesulfonyl chloride (see Marsais and coworkers, J. Org. Chem. 1987, 52, 1133-1136). Deoxygenation of the N-oxide was accomplished using the procedure of Aoyagi and coworkers, Synthesis 1997, 891.

NMR data was as follows:

¹H NMR (CDCl₃): δ 8.89-8.87 (m, 2H), 7.72-7.70 (m, 2H), 7.19 (d, 2H), 7.01 (d, 2H), 6.79 (d, 1H), 5.05-5.01 (m, 1H), 4.85-4.82 (m, 1H), 4.58 (d, 1H), 4.45 (d, 1H), 3.91 (s, 1H), 3.11-3.02 (m, 5H), 2.99 (s, 3H), 1.28-1.16 (m, 12H).

¹³C NMR (CDCl₃): δ 170.3, 167.7, 154.9, 151.5, 150.7, 144.2, 132.7, 130.3, 121.8, 120.9, 73.6, 69.7, 54.6, 53.1, 50.4, 37.5, 36.6, 36.3, 29.1, 23.6, 21.6, 21.5.

Example 252 Synthesis of N-(Pyridine-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 251 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (CD₃OD): δ 8.78 (d, 2H), 7.42 (d, 1H), 7.69 (d, 2H), 7.35 (d, 2H), 7.06 (d, 2H), 4.69-4.61 (m, 3H), 4.16 (s, 1H), 3.25-3.19 (m, 1H), 3.13-3.05 (m, 4H), 2.97 (s, 3H), 1.25 (s, 6H).

¹³C NMR (CD₃OD): δ 174.1, 170.5, 157.0, 152.2, 152.0, 147.2, 135.8, 131.8, 123.1, 122.7, 73.9, 55.6, 54.9, 54.4, 37.5, 36.8, 36.7, 30.1, 24.8.

Example 253 Synthesis of N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N-methyl-N-(2-dimethylaminoethyl)carbamyloxy)phenylalanine tert-Butyl Ester

A solution of the starting acid (500 mg), (2S)-2-amino-3-{4-[(2-dimethylaminoethyl)-methylcarbamoyloxy]phenyl}propionic acid tert-butyl ester (730 mg), HOBt (235 mg), and 4-methylmorpholine (0.87 mL) in DMF (10 mL) was stirred in ice bath at 0° C. 1-[3-(Dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (360 mg) was added to the solution. The ice bath was removed after 10 minutes. The reaction was stirred at room temperature for 3 hours. Ethyl acetate (20 mg) was added. The solution was washed with saturated NaHCO₃ solution (30 mL) 2 times, then washed with brine. The solution was dried with MgSO₄. The solvent was evaporated in vacua, and the residue flash chromatographed on silica gel to give 385 mg of the title compound.

Physical data was as follows:

MS: [(+)ESI], [M+H]⁺ 663.

Example 254 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N-methyl-N-(2-dimethylaminoethyl)carbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 253 and substitution of appropriate starting materials.

Physical data was as follows:

MS: [(+)ESI], [M+H]⁺ 617.

Example 255 Synthesis of N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiapropyl-L-4-(N-methyl-N-(2-dimethylaminoethyl)carbamyloxy)phenylalanine

The title compound was prepared from the product of Example 253 using the procedure described in Method 11.

Physical data was as follows:

MS: [(+)ESI], [M+H]⁺ 607.

Example 256 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(N-methyl-N-(2-dimethylaminoethyl)carbamyloxy)phenylalanine

The title compound was prepared from the product of Example 254 using the procedure described in Method 11.

Physical data was as follows:

MS: [(+)ESI], M+H]⁺ 561.

Example 257 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate staring materials, mp: 64-67° C.

Physical data was as follows:

MS: [M+H]⁺ 699.

Anal. Calcd. for C₃₁H₄₀ClFN₄O₇S₂.H₂O: C, 51.90; H, 5.9; N, 7.8.

Found: C, 51.53; H, 5.50; N, 7.62.

Example 259 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared for the product of Example 258 using the procedure described in Method 11.

Physical data was as follows:

MS: [M+1] 603.

Anal. Calcd. for C₂₄H₂₇FN₃O₇S₂: C, 49.02; H, 4.63; N, 7.15.

Found: C, 49.25; H, 4.89; N, 6.73.

Example 260 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 82 and substitution of appropriate starting materials, mp.111-114° C.

Physical data was as follows:

MS: +ESI [M+NH4]+719.

Anal. Calcd. for C₃₀H₃₇ClFN₃O₇S: C, 50.02; H, 5.46; N, 5.8.

Found: C, 50.23; H, 5.10; N, 5.50.

Example 261 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 82 and substitution of appropriate starting materials, mp. 77-81° C.

Physical data was as follows:

MS: [M+NH₄]+705.

Anal. Calcd. for C₂₉H₃₅ClFN₃O₇S₃: C, 50.61; H, 5.13; N, 6.1.

Found: C, 50.33; H, 5.07; N, 5.94.

Example 262 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(N,N-diethylcarbamyloxy)]phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate starting materials, mp. 65-69° C.

Physical data was as follows:

MS: [M+NH₄]⁺ 647.

Anal. Calcd. for C₂₇H₃₃ClFN₃O₇S₂: C, 51.46; H, 5.28; N, 6.4.

Found: C, 51.29; H, 5.19; N, 6.50.

Example 263 Synthesis of N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate starting materials, mp. 68-72° C.

Physical data was as follows:

MS: [M+H]⁺ 626.

Anal. Calcd. for C₂₈H₃₆ClN₃O₇S₂: C, 53.77; H, 5.80; N, 6.71.

Found: C, 53.26; H, 5.8; N, 6.63.

Example 264 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials.

Physical data was as follows:

MS: [M+H]⁺ 685.

Anal. Calcd. for C₃₀H₃₈ClN₄O₇: C, 52.59; H, 5.59; N, 8.18.

Found: C, 52.09; H, 5.48; N, 7.77.

Example 265 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-3-chloro-4-(N,N-dimethylcarbamyloxy)]phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate stating materials.

Physical data was as follows:

MS: [M+H]⁺ 580.

Anal. Calcd. for C₂₇H₃₄ClN₃O₇S.0.5 H₂O: C, 55.04; H, 6.00; N, 7.13.

Found: C, 55.06; H, 5.71; N, 6.93.

Example 266 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-(2′-pyridyl)-piperazin-1-ylcarbonyloxy)]phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials.

Physical data was as follows:

MS: [M+H]⁺ 748.

Anal. Calcd. for C₃₄H₃₉ClFN₅O₇S₂: C, 54.57; H, 5.25; N, 9.3.

Found: C, 54.26; H, 5.10; N, 9.07.

Example 267 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-3-chloro-4-(4-(2′-pyridyl)-piperazin-1-ylcarbonyloxy)]phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials, mp. 80-86° C.

Physical data was as follows:

MS: [M+H]⁺ 762.

Anal. Calcd. for C₃₅H₄₁ClFN₅O₇S₂: C, 55.14; H, 5.42; N, 9.19.

Found: C, 54.67; H, 5.40; N, 8.69.

Example 268 Synthesis of N-(4-Nitrobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate starting materials.

Physical data was as follows:

Anal. Calcd. for C₂₆H₃₂N₄O₉S: C, 54.16; H, 5.59; N, 9.72.

Found: C, 53.69; H, 5.24; N, 9.52.

Example 269 Synthesis of N-(4-Aminobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared from the product of Example 268 using the procedure described in Method 4.

Physical data was as follows:

Anal. Calcd. for C₂₆H₃₄N₄O₇S: C, 57.13; H, 6.27; N, 10.25.

Found: C, 56.30; H, 6.12; N, 10.05.

Example 270 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 82 and substitution of appropriate starting materials.

Physical data was as follows:

Anal. Calcd. for C₂₉H₃₇N₃O₇S₂: C, 57.69; H, 6.18; N, 6.96.

Found: C, 57.36; H, 5.99; N, 6.76.

Example 271 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-phenylcarbamylpiperazin-1-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 8.62 (s, 1H); 8.11 (d, 1H); 7.73 (d, 2H); 7.45 (m, 4H); 7.26 (m, 3H); 7.04 (m, 2H); 6.95 (m, 1H); 6.25 (d, 1H); 4.90 (m, 1H); 4.50 (m, 1H); 4.11 (m, 1H); 3.6 (br, 4H); 3.4 (br, 4H); 3.10 (m, 2H); 3.00 (m, 1H); 2.40 (s, 3H); 1.60 (m, 3H); 1.40 (m, 1H); 1.18 (d, 3H); 1.12 (d, 3H).

IR (KBr, cm⁻¹) 3400-3500(br), 2950, 2900, 1725, 1650, 1540, 1450, 1240, 1210, 1000, 760, 675, 580, 540.

MS ((+)ESI, m/z (%)) 706 (100 [M+H]⁺).

Anal. Calcd. for C₃₆H₄₃N₅O₈S.0.35 EtOAc: C, 60.98; H, 6.27; N, 9.51.

Found: C, 50.31; H, 6.16; N, 9.33.

Example 272 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-phenylcarbamylpiperazin-1-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 271 using the procedure described in Method 7.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 12.8 (s, 1H); 8.62 (s, 1H); 8.11 (d, 1H); 7.73 (d, 2H), 7.45 (m, 4H); 7.26 (m, 3H); 7.04 (m, 2H); 6.95 (m, 1H); 6.25 (d, 1H); 4.50 (m, 1H); 4.11 (m, 1H); 3.6 (br, 4H); 3.4 (br, 4H); 3.10 (m, 2H); 3.00 (m, 1H); 2.40 (s, 3H); 1.60 (m, 3H); 1.40 (m, 1H).

IR (KBr, cm⁻¹) 3400, 1725, 1650, 1540, 1450, 1240, 1210, 1000, 760, 675, 580, 540.

MS ((−)ESI, m/z (%)) 662 (100 [M−H]⁺).

Example 273 Synthesis of N-(1-n-Butylpyrazole-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 137 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (CDCl₃): δ 7.89 (s, 1H), 7.83 (s, 1H), 7.21 (d, 2H), 7.06 (d, 1H), 7.02 (d, 2H), 5.04 (sept, 1H), 4.89-4.82 (m, 1H), 4.57 (d, 1H), 4.41 (d, 1H), 4.16 (t, 2H), 3.78 (s, 1H), 3.14 (dd, 1H), 3.06 (dd, 1H), 3.09 (s, 3H), 3.00 (s, 3H), 1.85 (pent, 2H), 1.36-1.23 (m, 2H), 1.27 (s, 3H), 1.24 (d, 3H), 1.21 (d, 3H), 1.16 (s, 3H).

¹³C NMR (CDCl₃): δ 170.4, 168.3, 154.9, 150.7, 139.2, 131.8, 130.3, 121.8, 117.0, 73.8, 69.6, 54.8, 53.2, 52.7, 50.6, 37.7, 36.6, 36.3, 31.8, 28.9, 24.0, 21.6, 21.5, 19.4, 13.3.

Example 274 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(pyridin-4-ylcarbonyl)piperazin-1-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 8.69 (dd, 2H), 8.28 (d, 1H); 7.71 (d, 2H); 7.43 (m, 4H); 7.26 (d, 2H); 7.04 (d, 2H); 4.86 (m, 1H); 4.42 (m, 1H); 4.05 (m, 1H); 3.4-3.8 (brm, 9H); 3.05 (m, 3H); 2.40 (s, 3H); 1.60 (m, 3H); 1.40 (m, 1H); 1.18 (d, 3H); 1.15 (d, 3H).

IR (KBr, cm⁻¹) 3400, 1725, 1650, 1510, 1200, 1160, 1100, 1010, 650, 600, 550.

MS ((+)ESI, m/z (%)) 692 (100 [M+H]⁺).

Anal. Calcd. for C₃₅H₄₁N₅O₉S.0.75H₂O: C, 59.60; H, 6.07; N, 9.93

Found: C, 59.45; H, 5.86; N, 9.88.

Example 275 Synthesis of N-(Toluene-4-sulfonyl)-L-4-oxoprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 164 using the procedure described in Method 11.

Physical data was as follows:

MS [(−)ESI) [M−H]) 516.

Example 276 Synthesis of N-(Toluene-4-sulfonyl)-L-trans-4-hydroxyprolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 165 using the procedure described in Method 11.

Physical data was as follows:

MS [(−)ESI] [M−H]) 518.

Example 277 Synthesis of N-(4-Cyanobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate starting materials, mp. 166-167° C.

Example 278 Synthesis of N-(4-Aminobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 107 using the procedure described in Method 11.

Physical data was as follows:

Anal. Calcd. For C₂₃H₂₈N₄O₇S: C, 47.34; H, 4.84;N, 9.60.

Found: C, 47.57; H, 5.20; N, 8.75.

Example 279 Synthesis of N-(Toluene-4-sulfonyl)-L-4-oxoprolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-Butyl Ester

Acetonitrile (3 mL) was cooled to 40° C. (CH₃CN/dry ice). Oxalyl chloride (0.10 mL) was added. N-(Toluene-4-sulfonyl)-L-4-hydroxyprolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-butyl ester (300 mg) and dry DMSO (0.008 mL) were dissolved in acetonitrile (4 mL) and were added to the above solution. The reaction was stirred at −40° C. for half an hour under dry conditions. Triethylamine (0.33 mL) was added to the solution. The dry ice bath was removed after 5 minutes. The reaction was stirred at room temperature for 1 hour. The solvent was evaporated in vacuo, and ethyl acetate (15 mL) was added. The mixture was washed with water (3×), then washed with brine. The solution was dried over MgSO₄. The solvent was evaporated in vacuo, and the residue was flushed on a silica gel column to give 150 mg of the title compound, mp. 84-85° C.

Example 280 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-[3-(hydroxymethyl)piperidin-1-ylcarbonyloxy]phenylalanine

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials, mp. 84-85° C.

Example 281 Synthesis of N-(Toluene-4-sulfonyl)-L-(4,4-difluoro)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 2 and substitution of appropriate starting materials.

Physical data was as follows:

MS: [(+)ESI], [M+NH₄]⁺ 599.

Example 282 Synthesis of N-Toluene-4-sulfonyl)-L-(4,4-difluoro)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 281 using the procedure described in Method 7.

Physical data was as follows:

MS: [(+)ESI], [M+NH₄] 557.

Example 283 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-benzoylpiperazin-1-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 8.27 (d, 1H); 7.69 (d, 2H); 7.45 (m, 7H); 7.24 9d, 2H); 7.02 (d, 2H); 4.86 (m, 1H); 4.42 (m, 1H); 4.07 (m, 1H); 3.65 (br s, 4H); 3.45 (br s, 4H); 3.35 (m, 1H); 3.05 (m, 3H); 2.38 (s, 3H); 1.60 (m, 3H); 1.40 (m, 1H); 1.18 (d, 3H); 1.11 (d, 3H).

IR (KBr, cm⁻¹) 3400, 1725, 1675, 1625, 1510, 1425, 1350, 1250, 1175, 1110, 1010, 700, 660, 590, 550.

MS ((+)ESI, m/z (%)) 708 (100[M+NH₂]⁺).

Anal. Calcd. for C₃₆H₄₂N₄O₈S.0.5H₂O: C, 61.79; H, 6.19; N, 8.01.

Found: C, 61.64; H, 6.10; N, 7.72.

Example 284 Synthesis of N-(1-Methyl-1H-imidazole-4-sulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The carbamate was prepared by treatment of 1-methylimidazole-4-sulfonyl-Pro-Try-iPr ester with 4-nitrophenyl chloroformate, followed by addition of dimethylamine (triethylamine, methylene chloride, 0° C., stirred at room temperature overnight.) The crude product was purified by flash chromatography (silica, 95:3:2 EtOAc:EtOH;Et₃N), followed by recrystallization from EtOAc. A white solid was obtained, mp 162-164° C. (8.7 g, 66%).

Physical data was as follows:

Anal. Calcd. for C₂₄H₃₃N₅O₇S: C, 53.82; H, 6.21; N, 13.08.

Found: C, 53.47; H, 6.13; N, 12.96.

Example 286 Synthesis of N-(Toluene-4-sulfonyl)-L-4-(thiomorpholin-4-ylcarbonyloxy)prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 285 using the procedure described in Method 11, mp.116-118° C.

Example 287 Synthesis of N-(4-Cyanobenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials, mp. 70-71° C.

Example 288 Synthesis of N-(4-Amidinobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Methyl Ester

Methanol (dry) was cooled to 0° C. HCl was bubbled in the solution for 15 minutes to make a saturated solution. Example 277 was added and the reaction mixture was stirred at 0° C. for 30 minutes then at room temperature for 24 hours. The solvent was evaporated. NH₃ in methanol (2M, 5 mL) was added. The reaction was stirred at room temperature for 24 hours. The solvent was evaporated. The residue was purified by reverse phase HPLC in CH₃CN:H₂O (20:80). At a retention time of 12.45 minutes, the product was isolated and freeze-dried to provide the title compound.

NMR data was as follows:

¹H NMR (in DMSO) multiplet at 1.47-1.55 ppm (1H), 1.63-1.72 ppm (3H's), singlet at 2.87 ppm (3H's), singlet at 3.02 ppm (3H's), multiplet at 3.05-3.10 ppm (2H's), multiplet at 3.17-3.22 ppm (1H), multiplet at 3.37-3.42 ppm (1H), singlet at 3.62 ppm (3H's), multiplet at 4.21-4.23 ppm (1H), quartet at 4.48-4.56 ppm (1H), doublet at 7.00-7.03 ppm (2H's), doublet at 7.23-7.26 ppm (2H's), a broad peak at 7.20-7.50 ppm, doublet at 8.02-8.03 ppm (4H's), doublet at 8.48-8.52 ppm (1H).

Example 289 Synthesis of N-(Toluene-4-sulfonyl)-L-4-hydroxyprolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials, mp. 80-82° C.

Example 290 Synthesis of N-(Toluene-4-sulfonyl)-L-4-hydroxyprolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine

N-(Toluene-4-sulfonyl)-L-4-hydroxyprolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine tert-butyl ester (160 mg) was dissolved in formic acid (7 mL). The reaction was stirred at room temperature for 6 hours. The solvent was evaporated and the residue purified using reverse phase HPLC in 20:80 CH₃CN/water. At a retention time of 5.85 minutes, 50 mg of the title compound was obtained, mp. 170-172° C.

Example 291 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-benzoylpiperazin-1-ylcarbonyloxy)phenylalanine

The title compound was prepared from the product of Example 283 using the procedure described in Method 11.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 12.8 (s, 1H); 8.27 (d, 1H); 7.69 (d, 2H); 7.45 (m, 7H); 7.24 (d, 2H); 7.02 (d, 2H); 4.42 (m, 1H); 4.07 (m, 1H); 3.65 (br s, 4H); 3.45 (br s, 4H); 3.35 (m, 1H); 3.05 (m, 3H); 2.38 (s, 3H); 1.60 (m, 3H); 1.40 (m, 1H).

IR (KBr, cm⁻¹) 3400, 1725, 1675, 1625, 1510, 1425, 1350, 1260, 1175, 1110, 1010, 700, 660, 590, 550.

MS ((+)ESI, m/z (%)) 666 (100[M+NH₄]⁺).

Anal. Calcd. for C₃₃H₃₆N₄O₈S.0.66H₂O: C, 60.00; H, 5.69; N, 8.48

Found: C, 60.36; H, 5.70; N, 7.81.

Example 292 Synthesis of N-(4-Amidinobenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine Methyl Ester

The title compound was prepared following the procedure described for the preparation of Examples 287 and 288.

Physical data was as follows:

MS: [(+)ESI] [M+H] 604.

Example 293 Synthesis of N-(3-Fluorobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 166 using the procedure described in Method 11, mp. 82-83° C.

Example 294 Synthesis of N-(Toluene-4-sulfonyl)-L-prolyl-L-4-[N-methyl-N-(2-(N′-methyl-N′-toluenesulfonyl-amino)ethyl)carbamyloxy]phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 8.27 (d, 1H); 7.71 (d, 2H); 7.69 (d, 2H); 7.40 (m, 4H); 7.24 (d, 2H); 6.99 (d, 2H); 4.86 (m, 1H); 4.43 (m, 1H); 4.06(m, 1H); 3.51 (m, 1H); 3.2-3.35 (m, 3H); 2.9-3.2 (overlapping m, 7H); 2.67 (d, 3H); 2.38 (s, 6H); 1.60 (m, 3H); 1.40 (m, 1H); 1.20 (d, 3H); 1.15 (d, 3H).

IR (KBr, cm⁻¹) 3400, 2975, 2950, 1725, 1680, 1510, 1450, 1400, 1280, 1225, 1150, 1110, 800, 730, 675, 575, 550.

MS ((+)ESI, m/z (%)) 760 (100 [M+NH₄]⁺).

Anal. Calcd. for C₃₆H₄₆N₄O₉S₂: C, 58.20; H, 6.24; N, 7.54.

Found: C, 57.90; H, 6.30; N, 7.34.

Example 295 Synthesis of N-(Toluene-4-sulfonyl)-L-propyl-L-4-[N-(2-(N′-phenylaminocarbonyloxy)ethyl)carbamyloxy)]phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described for the preparation of Example 4 and substitution of appropriate starting materials.

NMR data was as follows:

¹H NMR (DMSO-d₆, 400 MHz): δ 9.67 (s, 1H); 8.27 (d, 1H); 7.72 (d, 2H); 7.47 (d, 2H); 7.42 (d, 2H); 7.24 (m, 4H); 6.98 (m, 3H); 4.87 (m, 1H); 4.45 (m, 1H); 4.18 (m, 2H); 4.05 (m, 1H); 3.4 (m, 3H); 3.05 (m, 3H); 2.40 (s, 3H); 1.6 (m, 3H); 1.40 (m, 1H); 1.2 (d, 3H); 1.15 (d, 3H).

IR (KBr, cm⁻¹) 3350, 2950, 1725, 1675, 1600, 1550, 1500, 1325, 1200, 1150, 1100, 650, 575, 525.

MS ((+)ESI, m/z (%)) 698 (100 [M+NH₄]⁺).

Anal. Calcd. for C₃₄H₄₀N₄O₉S.0.21 EtOAc. 0.5H₂O: C, 59.08; H, 6.07; N, 7.91.

Found: C, 59.08; H, 6.02; N, 7.80.

Example 296 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-4-(trans-hydroxy)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine Isopropyl Ester

The title compound was prepared following the procedure described in Example 2 and substitution of appropriate starting materials.

Physical data was as follows:

MS: [(+)ESI], [M+NH₄] 583.

Example 297 Synthesis of N-(4-Fluorobenzenesulfonyl)-L-4-(trans-hydroxy)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The title compound was prepared following the procedure described in Example 2 and substitution of appropriate starting materials.

Physical data was as follows:

MS: [(+)ESI], [M+NH₄] 597.

Example 298 Synthesis of N-(4-Amidinobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The title compound was prepared from the product of Example 288 using the procedure described in Method 5, mp. 130-132° C.

Example 299 Synthesis of Piperazine-1,4-dicarboxylic Acid Bis-{4-[(2S)-2-tert-butoxycarbonyl-2-((4R)-5,5-dimethyl-3-(toluene-4-sulfonyl)thiazolidine-4-carboxamido)ethyl]phenyl} Ester

The title compound was prepared following the procedure described in Example 4, except that 0.5 equivalents of piperazine were used.

Physical data was as follows:

Anal. Calcd. for C₅₈H₇₄N₆O₁₄S₄: C, 57.69; H, 6.18; N, 6.96.

Found: C, 58.01; H, 6.07; N, 6.68.

Example 300 Synthesis of Piperazine-1,4-dicarboxylic Acid Bis-{4-[(2S)-2-carboxy-2-((4R)-5,5-dimethyl-3-(toluene-4-sulfonyl)thiazolidine-4-carboxamido)ethyl]phenyl} Ester

The title compound was prepared by hydrolysis of the di-t-butyl ester from Example 299 with formic acid to give a white foam (300 mg, quantitative).

Physical data was as follows:

Anal. Calcd. for C₅₀H₅₈N₆O₁₄S₄: C, 54.83; H, 5.34; N, 7.67

Found: C, 55.10; H, 5.57; N, 7.37.

Other compounds prepared by the methods described above include those set forth in Examples 301-373 in Tables IIIA and IIIB below.

TABLE IIIA

No. R¹ R² R³ R⁵ R^(6′) 301 p-CH₃-φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ -CH₂CH₂—NH—CH₂— (L-piperizinyl) 302 p-F-φ- R²R³ = cyclic p[(2-hydroxymethyl)pyrrolidin- —OC(CH₃)₃ -CH₂S—C(CH₃)₂- 1-yl-C(O)O-]-benzyl- (L-5,5-dimethylthiazolidin-4-yl) 303 p-F-φ- R²R³ = cyclic p[(2-hydroxymethyl)pyrrolidin- —OH -CH₂S—C(CH₃)₂- 1-yl-C(O)O-]-benzyl- (L-5,5-dimethylthiazolidin-4-yl) 304 p-CH₃φ- R²R³ = cyclic p[(2-(CH₃OC(O)-)pyrrolidin-yl)-C(O)O-]benzyl- —OC(CH)₃ 3 carbons atoms (L-pyrrolidinyl) 305 p-F-φ- R²R³ = cyclic 3-chloro-4-[(thiomorpholin-4-yl)-C(O)O-]benzyl- —OH -CH₂S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 306 p-F-φ- R²R³ = cyclic p-[(pyridin-2-yl)piperazine-1-yl)-C(O)O-]benzyl - —OH -CH₂S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 307 p-F-φ- R²R³ = cyclic p-[(pyridin-2-yl)piperazine-1-yl)-C(O)O-]benzyl - —OC(CH₃)₃ -CH₂S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 308 p-CH₃-φ- R²R³ = cyclic p-[(thiomorpholin-4-yl)-C(O)O-]benzyl- —OC(CH₃)₃ -CH₂CH(OH)CH₂- (L-4-hydroxypyrrolidinyl) 309 p-CH₃φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —O(CH₂CH₂O)₂CH₃ 3 carbons atoms (L-pyrrolidinyl) 310 p-F-φ- R²R³ = cyclic p-[(4-(pyrimidin-2-yl)piperazin-1-yl)- —OC(CH₃)₃ -CH₂—S—C(CH₃)₂- C(O)O-]benzyl- (L-5,5-dimethylthiazolidin-4-yl) 311 p-F-φ- R²R³ = cyclic 3-flouro-4-[(CH₃)₂NC(O)O-]-benzyl- —OCH(CH₃)₂ -CH₂—S—C(CH₃)₂- (l-5,5-dimethylthiazolidin-4-4yl) 312 p-CH₃-φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₂ -CH₂CH₂N SO₂CH₃)—CH₂- (L-4-methanesulfonyl-piperizinyl) 313 R¹/R² = H p-[(CH₃)₂NC(O)O-]benzyl- —OH 1,1-dioxo-2,3-dihydro-3,3- dimethyl-1,2-benzisothiazol-2-yl- 314 R¹/R² = H p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ N-2,10-camphorsultamyl- 315 R¹/R² = H p-[(CH₃)₂NC(O)O-]benzyl- —OH N-2,10-camphorsultamyl- 316 R¹/R² = H 3-chloro-4-[(CH₃)₂NC(O)O)-]-benzyl- —OCH(CH₃)₂ N-2,10-camphorsultamyl- 317 p-Br-φ- R²R³ = cyclic p[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ -CH₂—S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 318 p-Br-φ- R²R³ = cyclic p[(CH₃)₂NC(O)O-]benzyl- —OH -CH₂—S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 319 p-CH₃-φ- R²R³ = cyclic —CH₂CH(OH)—CH₂- (L-4-hydroxypyrrolidinyl) 320 p-F-φ- R²R³ = cyclic p-[(4-pyrimidin-2-yl)piperazin-1-yl)-C(O)O-]benzyl- —OH -CH₂—S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 321 p-F-φ- R²R³ = cyclic p-[(4-pyrimidin-2-yl)piperazin-1-yl)-C(O)O-]benzyl- —OCH(₃)₂ -CH₂—S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 322 p-F-φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH -CH₂—CH₂—S- (thiazolidin-2-yl) 323 p-F-φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ -CH₂—CH₂—S- (thiazolidin-2-yl) 324 p-CH₃-φ- R²R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-]benzyl- —OH -CH₂C(O)—CH₂- (L-4-oxopyrrolidinyl) 325 p-CH₃-φ- R²R³ = cyclic p-[(4-methylpiperazin-1-yl)-C(O)O-]benzyl- —OH -CH₂C(O)—CH₂- (L-4-oxopyrrolidinyl) 326 p-Fφ- R²R³ = cyclic p[(4-(pyridin-2-yl)piperazin-1-yl)-C(O)O-]benzyl- —OH -CH₂CH₂—S- (thiazolidin-2-yl) 327 p-NO₂-φ- R²R³ = cyclic p-[(4-(piridin-2-yl)piperazin-1-yl)-C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) 328 p-F-φ- R²R³ = cyclic p-[(4-(piridin-2-yl)piperazin-1-yl)-C(O)O-]benzyl- —OC(CH₃)₃ -CH₂—CH₂—S- (thiazolidin-2-yl) 329 p-Br-φ- R²R³ = cyclic p-[(4-(piridin-2-yl)piperazin-1-yl)-C(O)O-]benzyl- —OH -CH₂—S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 330 p-CH₃-φ- R²R³ = cyclic p-[(4-(φNHC(S)-)piperazin-1-yl)-C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) 331 p-F-φ- R²R³ = cyclic p-[(4-CH₃-homopiperazin-1-yl)-C(O)O-]benzyl- -OC(CH₃)₃ -CH₂CH₂—S- (thiazolidin-2-yl) 332 p-CH₃-φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ -CH₂CH(—OSO₂CH₃—CH₂- (L-4-methanesulfoxy-pyrrolidinyl) 333 p-H₂NC(O)-φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) 334 p-H₂NC(O)-φ- R²R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-)benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) 335 p-H₂NC(═N)-φ- R²R³ = cyclic p-[(thiomorpholin-4-yl)C(O)O-)benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) 336 p-NO₂-φ- R²R³ = cyclic p[(4-(pyridin-2-yl)piperazin-1-yl)-C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) 337 p-F-φ- R²R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin- —OCH₂CH₃ -CH₂—S—C(CH₃)₂- 1-yl(C(O)O-]-benzyl- (L-5,5-dimethylthiazolidin-4-yl) 338 p-F-φ- R²R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin- —OH -CH₂—S—C(CH₃)₂- 1-yl(C(O)O-]-benzyl- (L-5,5-dimethylthiazolidin-4-yl) 339 p-F-φ- R²R³ = cyclic p-[(4-CH₃-homopiperizin-1-yl)C(O)O-]benzyl- —OH -CH₂—CH₂—S- (thiazolidin-2-yl) 340 1-methylpyrazol-4-yl- R²R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O-]benzyl- —OCH(CH₃)₂ -CH₂—S—C(CH₂)₂₋ (L-5,5-dimethylthiazolidin-4-yl) 341 1-methylpyrazol-4-yl- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) 342 1-methylpyrazol-4-yl- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) 343 p-CH₃-φ- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH 3 carbon atoms (L-pyrrolidinyl) 344 p-CH₃-φ- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) 345 p-CH₃-φ- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) 346 p-F-φ- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) 347 p-F-φ- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) 348 p-CH₃-φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH -CH₂CH₂N(—SO₂—CH₃)CH₂- (4-methanesulfonyl-piperizin-2-yl) 349 p-CH₃-φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OH -CH₂CH(—OSO₂—CH₃)CH₂- (L-4-methanesulfoxy-pyrrolidinyl) 350 CH₃— —CH₂φ H p-[(CH₃)₂NC(O)O-]benzyl- —OC(CH₃)₃ 351 p-Br-φ- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ -CH₂—S—CH(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 352 p-CF₃O-φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-benzyl- —OH -CH₂—S—CH(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 353 p-CF₃O-φ- R²R³ = cyclic p-[(CH₃)₂NC(O)O-benzyl- —OH -CH₂—S—CH(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 354 p-CF₃O-φ- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ -CH₂—S—CH(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 355 p-F-φ- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH 3 carbons atoms (L-pyrrolidinyl) 356 p-F-φ- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH -CH₂CH(OH)CH₂- (L-4-hydroxypyrrolidinyl) 357 p-CF₃O-φ- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH -CH₂—S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 358 1-methyllimidazol-4-yl- R²R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O)-]benzyl- —OH 3 carbons atoms (L-pyrrolidinyl) 359 1-methyllimidazol-4-yl- R²R³ = cyclic 3-chloro-4-[(CH₃)₂NC(O)O)-]benzyl- —OCH(CH₃)₂ 3 carbons atoms (L-pyrrolidinyl) 360 1-methyllimidazol-4-yl- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH 3 carbons atoms (L-pyrrolidinyl) 361 1-methyllimidazol-4-yl- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH -CH₂—S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 362 1-methyllimidazol-4-yl- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OH 3 carbons atoms (L-pyrrolidinyl) 363 1-methyllimidazol-4-yl- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OCH(CH₃)₂ 3 carbons atoms (L-pyrrolidinyl) 364 1-methyllimidazol-4-yl- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ 3 carbons atoms (L-pyrrolidinyl) 365 1-methyllimidazol-4-yl- R²R³ = cyclic p-[(4-(pyridin-2-yl)piperazin-1-yl)C(O)O-]benzyl- —OC(CH₃)₃ -CH₂—S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 366 1-methyllimidazol-4-yl- R²R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin- —OCH(CH₃)₂ 3 carbons atoms 1-yl)C(O)O]benzyl- (L-pyrrolidinyl) 367 1-methyllimidazol-4-yl- R²R³ = cyclic p-[(CH₃)₂NC(O)O-]benzyl- —OCH₂CH₂Oφ -CH₂—S—C(CH₃)₂- (L-5,5-dimethylthiazolidin-4-yl) 368 1-methyllimidazol-4-yl- R²R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin- —OH -CH₂—S—C(CH₃)₂- 1-yl)C(O)O-]-benzyl- (L-5,5-dimethylthiazolidin-4-yl) 369 1-methyllimidazol-4-yl- R²R³ = cyclic 3-chloro-4-[(4-(pyridin-2-yl)piperazin- —OCH₂CH₃ -CH₂—S—C(CH₃)₂- 1-yl)C(O)O-]-benzyl- (L-5,5-dimethylthiazolidin-4-yl) 370 1,5-dimethyl-3- R²R³ = cyclic p-[4-]5-CF₃-pyridin-2-yl)piperazin- —OH chloropyrazol-4-yl 1-yl)-C(O)O-benzyl-

TABLE IIIB

No. R¹ R² R³ A R^(6′) 371 p-CH₃-100 - R²/R³ cyclic —OC(O)-(piperazin-1,4-diyl)-C(O)O- —OCH(CH₃)₂ 3 carbon atoms (L-pyrrolidinyl) 372 p-CH₃-100 - R²/R³ cyclic —OC(O)-(piperazin-1,4-diyl)-C(O)O- —OC(CH₃)₃ 3 carbon atoms (L-pyrrolidinyl) 371 p-CH₃-100 - R²/R³ cyclic —OC(O)-(piperazin-1,4-diyl)-C(O)O- —OH 3 carbon atoms (L-pyrrolidinyl)

In addition, Examples 319, 324, 325, 332, 333, 334, 335 and 349 in Table IIIA are exemplified as follows:

Example 319 Synthesis of N-(Toluene-4-sulfonyl)-L-(4-hydroxy)prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine

The starting N-(toluene-4-sulfonyl)-L-(4-hydroxy)prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-butyl ester (300 mg) was dissolved in formic acid (15 mL). The reaction was stirred at room temperature for 72 hours. The solvent was evaporated and the residue was purified using HPLC, reverse phase, 20-80% CH₃CN/water. At a retention time of 10.75 minutes, 82 mg of the title compound was obtained, mp: 128-130° C.

Example 324 Synthesis of N-(Toluene-4-sulfonyl)-L-(4-oxo)prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine

The starting N-(toluene-4-sulfonyl)-L-(4-oxo)prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine tert-butyl ester (130 mg) was dissolved in formic acid (7 mL). The reaction was stirred at room temperature for 6 hours. The solvent was evaporated in vacuo to give 150 mg of the desired product, mp: 111-112° C.

Example 325 Synthesis of N-(Toluene-4-sulfonyl)-L-(4-oxo)prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine

The starting N-(toluene-4-sulfonyl)-L-(4-oxo)prolyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-butyl ester (150 mg) was dissolved in formic acid (7 mL). The reaction was stirred at room temperature for 6 hours. The solvent was evaporated in vacuo, and the residue was purified using HPLC, reverse phase, 20-80% CH₃CH/water. The retention time was 10.34 minutes. The product was freeze dried to yield 82 mg of the title compound, mp: 99-101° C.

Example 332 Synthesis of N-(Toluene-4-sulfonyl)-L-(4-methanesulfonyloxy)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-Butyl Ester

The starting N-(toluene-4-sulfonyl)-L-(4-hydroxy)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-butyl ester (300 mg) and methylsulfonyl chloride was dissolved in THF (7 mL) at 0° C. in an ice bath. Triethylamine (0.21 mL) was added. The ice bath was removed after 10 minutes. The reaction mixture was stirred at room temperature for 24 hours. Ethyl acetate (20 mL) as added. The mixture was washed with citric acid (5%, 20 mL, 2×), and washed with saturated NaHCO₃ solution (20 mL), then with brine. The solution was dried over MgSO₄. The solvent was evaporated, and the residue was flushed on a silica gel column. The solvent was evaporated in vacuo to give 300 mg of the desired product, mp: 73-74° C.

Example 333 Synthesis of N-(4-Aminobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The starting N-(4-aminobenzenesulfonyl)-L-prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine methyl ester (300 mg) and LiOH solution (2M, 0.6 mL) were added to methanol (6 mL). The reaction was stirred at room temperature for 7 hours. The solvent was evaporated in vacuo, and the residue was purified using HPLC, reverse phase, 20-80% CH₃CN/water. At a retention time of 12.11 minutes, 27 mg of the desired product were obtained, mp: 130-132° C.

Example 334 Synthesis of N-(4-Aminocarbonylbenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine

The starting N-(4-aminocarbonylbenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine methyl ester (300 mg) and LiOH solution (2M, 0.5 mL) were added to methanol (6 mL). The reaction was stirred at room temperature for 8 hours. The solvent was evaporated in vacuo, and the residue purified using HPLC, reverse phase, 20-80% CH₃CN/water. At a retention time of 12.69 minutes, 20 mg of the desired product was obtained, mp: 123-125° C.

Example 335 Synthesis of N-(4-Amidinobenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine

The starting N-(4-amidinobenzenesulfonyl)-L-prolyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine methyl ester (300 mg) and LiOH solution (2M, 0.5 mL) were added to methanol (6 mL). The reaction was stirred at room temperature for 8 hours. The solvent was evaporated in vacuo, and the residue was purified using HPLC, reverse phase, 20-80% CH₃CN/water. At a retention time of 11.78 minutes, 25 mg of the desired product were obtained, mp: 123-125° C.

Example 349 Synthesis of N-(Toluene-4-sulfonyl)-L-(4-methanesulfonyloxy)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine

The starting N-(toluene-4-sulfonyl)-L-(4-methanesulfonyloxy)prolyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-butyl ester (200 mg) was dissolved in formic acid (5 mL). The reaction mixture was stirred at room temperature for 6 hours. The solvent was evaporated in vacuo to provide the desired product (195 mg), mp: 83-84° C.

Example A In vitro Assay for Determining Binding of Candidate Compounds to VLA-4

An in vitro assay was used to assess binding of candidate compounds to α₄β₁ integrin. Compounds which bind in this assay can be used to assess VCAM-1 levels in biological samples by conventional assays (e.g., competitive binding assays). This assay is sensitive to IC₅₀ values as low as about 1 nM.

The activity of α₄β₁ integrin was measured by the interaction of soluble VCAM-1 with Jurkat cells (e.g., American Type Culture Collection Nos. TIB 152, TIB 153, and CRL 8163), a human T-cell line which expresses high levels of α₄β₁ intergrin. VCAM-1 interacts with the cell surface in an α₄β₁ intergrin-dependent fashion (Yednock, et al. J. Bio. Chem., 1995, 270:28740).

Recombinant soluble VCAM-1 was expressed as a chimeric fusion protein containing the seven extracellular domains of VCAM-1 on the N-terminus and the human IgG₁ heavy chain constant region on the C-terminus. The VCAM-1 fusion protein was made and purified by the manner described by Yednock, supra.

Jurkat cells were grown in RPMI 1640 supplemented with 10% fetal bovine serum, penicillin, streptomycin and glutamine as described by Yednock, supra.

Jurkat cells were incubated with 1.5 mM MnCl₂ and 5 μg/mL 15/7 antibody for 30 minutes on ice. Mn⁺² activates the receptor to enhance ligand binding, and 15/7 is a monoclonal antibody that recognizes an activated/ligand occupied conformation of α₄β₁ integrin and locks the molecule into this conformation thereby stabilizing the VCAM-1/α₄β₁ integrin interaction. Yednock, et al., supra. Antibodies similar to the 15/7 antibody have been prepared by other investigators (Luque, et al, 1996, J. Bio. Chem. 271:11067) and may be used in this assay.

Cells were then incubated for 30 minutes at room temperature with candidate compounds, in various concentrations ranging from 66 μg/mL to 0.01 μg/mL using a standard 5-point serial dilution. 15 μL soluble recombinant VCAM-1 fusion protein was then added to Jurkat cells and incubated for 30 minutes on ice. (Yednock et al., supra.).

Cells were then washed two times and resuspended in PE-conjugated goat F(ab′)₂ anti-mouse IgG Fc (Immunotech, Westbrook, Me.) at 1:200 and incubated on ice, in the dark, for 30 minutes. Cells were washed twice and analyzed with a standard fluorescence activated cell sorter (“FACS”) analysis as described in Yednock, et al., supra.

Compounds having an IC₅₀ of less than about 15 μM possess binding affinity to α₄β₁.

When tested in this assay, each of the compounds of Examples 1-373 (or the corresponding carboxylic acids of the ester compounds, i.e. the prodrugs) has an IC₅₀ of 15 μM or less.

Example B In vitro Saturation Assay for Determining Binding of Candidate Compounds to α₄β₁

The following describes an in vitro assay to determine the plasma levels needed for a compound to be active in the Experimental Autoimmune Encephalomyelitis (“EAE”) model, described in the next example, or in other in vivo models.

Log-growth Jurkat cells are washed and resuspended in normal animal plasma containing 20 μg/ml of the 15/7 antibody (described in the above example).

The Jurkat cells are diluted two-fold into either normal plasma samples containing known candidate compound amounts in various concentrations ranging from 66 μg/mL to 0.01 μg/mL, using a standard 12 point serial dilution for a standard curve, or into plasma samples obtained from the peripheral blood of candidate compound-treated animals.

Cells are then incubated for 30 minutes at room temperature, washed twice with phosphate-buffered saline (“PBS”) containing 2% fetal bovine serum and 1 mM each of calcium chloride and magnesium chloride (assay medium) to remove unbound 15/7 antibody.

The cells are then exposed to phycoerythrin-conjugated goat F(ab′) anti-mouse IgG Fc (Immunotech, Westbrook, Me.), which has been adsorbed for any non-specific cross-reactivity by co-incubation with 5% serum from the animal species being studied, at 1:200 and incubated in the dark at 4° C. for 30 minutes.

Cells are washed twice with assay medium and resuspended in the same. They are then analyzed with a standard fluorescence activated cell sorter (“FACS”) analysis as described in Yednock et al. J. Bio. Chem., 1995, 270:28740.

The data is then graphed as fluorescence versus dose, e.g., in a normal dose-response fashion. The dose levels that result in the upper plateau of the curve represent the levels needed to obtain efficacy in an in vivo model.

This assay may also be used to determine the plasma levels needed to saturate the binding sites of other integrins, such as the α₉β₁ integrin, which is the integrin most closely related α₄β₁ (Palmner et al, 1993, J. Cell Bio., 123:1289). Such binding is predictive of in vivo utility for inflammatory conditions mediated by α₄β₁ integrin, including by way of example, airway hyper-responsiveness and occlusion that occurs with chronic asthma, smooth muscle cell proliferation in atherosclerosis, vascular occlusion following angioplasty, fibrosis and glomerular scarring as a result of renal disease, aortic stenosis, hypertrophy of synovial membranes in rheumatoid arthritis, and inflammation and scarring that occur with the progression of ulcerative colitis and Crohn's disease.

Accordingly, the above-described assay may be performed with a human colon carcinoma cell line, SW 480 (ATTC #CCL228) transfected with cDNA encoding α₉ integrin (Yokosaki et al., 1994, J. Bio. Chem., 269:26691), in place of the Jurkat cells, to measure the binding of the α₉β₁ integrin. As a control, SW 480 cells which express other α and β₁ subunits may be used.

Using this assay, the plasma levels necessary to obtain efficacy in in vivo models for α₄β₁ and α₉β₁ have been established for compounds of formula I tested in this assay.

Accordingly, another aspect of this invention is directed to a method for treating a disease in a mammalian patient, which disease is mediated by α₉β₁, and which method comprises administering to said patient a therapeutically effective amount of a compound of this invention. Such compounds are preferably administered in a pharmaceutical composition described herein above. Effective daily dosing will depend upon the age, weight, condition of the patient which factors can be readily ascertained by the attending clinician. However, in a preferred embodiment, the compounds are administered from about 20 to 500 μg/kg per day.

Example C In vivo Evaluation

The standard multiple sclerosis model, Experimental Autoimmune (or Allergic) Encephalomyelitis (“EAE”), was used to determine the effect of candidate compounds to reduce motor impairment in rats or guinea pigs. Reduction in motor impairment is based on blocking adhesion between leukocytes and the endothelium and correlates with anti-inflammatory activity in the candidate compound. This model has been previously described by Keszthelyi et al., Neurology, 1996, 47:1053-1059, and measures the delay of onset of disease.

Brains and spinal cords of adult Hartley guinea pigs were homogenized in an equal volume of phosphate-buffered saline. An equal volume of Freund's complete adjuvant (100 mg mycobacterium tuberculosis plus 10 ml Freund's incomplete adjuvant) was added to the homogenate. The mixture was emulsified by circulating it repeatedly through a 20 ml syringe with a peristaltic pump for about 20 minutes.

Female Lewis rats (2-3 months old, 170-220 g) or Hartley guinea pigs (20 day old, 180-200 g) were anesthetized with isoflurane and three injections of the emulsion, 0.1 ml each, were made in each flank. Motor impairment onset is seen in approximately 9 days.

Candidate compound treatment began on Day 8, just before onset of symptoms. Compounds were administered subcutaneously (“SC”), orally (“PO”) or intraperitoneally (“IP”). Doses were given in a range of 10 mg/kg to 200 mg/kg, bid, for five days, with typical dosing of 10 to 100 mg/kg SC, 10 to 50 mg/kg PO, and 10 to 100 mg/kg IP.

Antibody GG5/3 against α₄β₁ integrin (Keszthelyi et al., Neurology, 1996, 47:1053-1059), which delays the onset of symptoms, was used as a positive control and was injected subcutaneously at 3 mg/kg on Day 8 and 11.

Body weight and motor impairment were measured daily. Motor impairment was rated with the following clinical score:

0 no change 1 tail weakness or paralysis 2 hindlimb weakness 3 hindlimb paralysis 4 moribund or dead

A candidate compound was considered active if it delayed the onset of symptoms, e.g., produced clinical scores no greater than 2 or slowed body weight loss as compared to the control.

When tested in this in vivo assay, the compounds of Examples 4, 9, 11, 12, 16, 51, 66, 73, 75, 82, 95, 101, 117, 137 and other Examples were active in this assay.

Example D Asthma Model

Inflammatory conditions mediated by α₄β₁ integrin include, for example, airway hyper-responsiveness and occlusion that occurs with chronic asthma. The following describes an asthma model which can be used to study the in vivo effects of the compounds of this invention for use in treating asthma.

Following the procedures described by Abraham et al, J. Clin. Invest, 93:776-787 (1994) and Abraham et al, Am J. Respir Crit Care Med, 156:696-703 (1997), both of which are incorporated by reference in their entirety, compounds of this invention were formulated into an aerosol and administered to sheep which are hypersensitive to Ascaris suum antigen. Compounds which decrease the early antigen-induced bronchial response and/or block the late-phase airway response, e.g., have a protective effect against antigen-induced late responses and airway hyper-responsiveness (“AHR”), are considered to be active in this model.

Allergic sheep which are shown to develop both early and late bronchial responses to inhaled Ascaris suum antigen were used to study the airway effects of the candidate compounds. Following topical anesthesia of the nasal passages with 2% lidocaine, a balloon catheter was advanced through one nostril into the lower esophagus. The animals were then intubated with a cuffed endotracheal tube through the other nostril with a flexible fiberoptic bronchoscope as a guide.

Pleural pressure was estimated according to Abraham (1994). Aerosols (see formulation below) were generated using a disposable medical nebulizer that provides an aerosol with a mass median aerodynamic diameter of 3.2 μm as determined with an Andersen cascade impactor. The nebulizer was connected to a dosimeter system consisting of a solenoid valve and a source of compressed air (20 psi). The output of the nebulizer was directed into a plastic T-piece, one end of which was connected to the inspiratory port of a piston respirator. The solenoid valve was activated for 1 second at the beginning of the inspiratory cycle of the respirator. Aerosols were delivered at V_(T) of 500 mL and a rate of 20 breaths/minute. A 0.5% sodium bicarbonate solution only was used as a control.

To assess bronchial responsiveness, cumulative concentration-response curves to carbachol were generated according to Abraham (1994). Bronchial biopsies were taken prior to and following the initiation of treatment and 24 hours after antigen challenge. Bronchial biopsies were preformed according to Abraham (1994).

An in vitro adhesion study of alveolar macrophages were also performed according to Abraham (1994), and a percentage of adherent cells was calculated.

Aerosol Formulation

A solution of the candidate compound in 0.5% sodium bicarbonate/saline (w/v) at a concentration of 30.0 mg/mL was prepared using the following procedure:

A. Preparation of 100 mL of 0.5% Sodium Bicarbonate/Saline Stock Solution:

Ingredient Gram/100.0 mL Final Concentration Sodium Bicarbonate 0.5 g 0.5% Saline q.s. ad 100.0 mL q.s. ad 100%

Procedure:

1. Add 0.5 g sodium bicarbonate into a 100 mL volumetric flask.

2. Add approximately 90.0 mL saline and sonicate until dissolved.

3. Q.S. to 100.0 mL with saline and mix thoroughly.

B. Preparation of 10.0 mL of 30.0 mg/mL Candidate Compound:

Ingredient Gram/10.0 mL Final Concentration Candidate Compound 0.300 g 30.0 mg/mL 0.5% Sodium Bicarbonate/ q.s. ad 10.0 mL q.s ad 100% Saline Stock Solution

Procedure:

1. Add 0.300 g of the candidate compound into a 10.0 mL volumetric flask.

2. Add approximately 9.7 mL of 0.5% sodium bicarbonate/saline stock solution.

3. Sonicate until the candidate compound is completely dissolved.

4. Q.S. to 10.0 mL with 0.5% sodium bicarbonate/saline stock solution and mix thoroughly.

Compounds of this invention were found to be active in this model. Additionally, using a conventional oral formula, a compound of this invention was active in this model. 

1. A compound of formula I:

wherein R¹ is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocylic, heteroaryl and substituted heteroaryl; R² is selected from the group consisting of hydrogen, alkyl, cycloalkyl, substituted cycloalkyl, cycloalkenyl, substituted cycloalkenyl, heterocyclic, substituted heterocyclic, substituted alkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl; R³ is selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic, and substituted heterocyclic; R⁵ is —(CH₂)_(x)—Ar—R^(5′) where R^(5′) is selected from the group consisting of —O-Z-NR⁸R^(8′) and —O-Z-R¹² wherein R⁸ and R^(8′) are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocyclic, and where R⁸ and R^(8′) are joined to form a heterocycle or a substituted heterocycle, R¹² is selected from the group consisting of heterocycle and substituted heterocycle, and Z is selected from the group consisting of —C(O)— and —SO₂—, Ar is aryl, heteroaryl, substituted aryl or substituted heteroaryl, x is an integer of from 1 to 4; Q is —C(X)NR⁷— wherein R⁷ is selected from the group consisting of hydrogen and alkyl; and X is selected from the group consisting of oxygen and sulfur; and pharmaceutically acceptable salts thereof.
 2. A compound of formula IA:

wherein R¹ is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocyclic, heteroaryl and substituted heteroaryl; R² is selected from the group consisting of hydrogen, alkyl, cycloalkyl, substituted cycloalkyl, cycloalkenyl, substituted cycloalkenyl, heterocyclic, substituted heterocyclic, substituted alkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl; R³ is selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic; R⁵ is —(CH₂)_(x)—Ar—R^(5′) and R^(5′) is selected from the group consisting of —O-Z-NR⁸ R^(8′) and —O-Z-R¹² wherein R⁸ and R^(8′) are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocyclic, and where R⁸ and R^(8′) are joined to form a heterocycle or a substituted heterocycle, R¹² is selected from the group consisting of heterocycle and substituted heterocycle, and Z is selected from the group consisting of —C(O)— and —SO₂—, Ar is aryl, heteroaryl, substituted aryl or substituted heteroaryl, x is an integer of from 1 to 4; R⁶ is selected from the group consisting of amino, alkoxy, substituted alkoxy, cycloalkoxy, substituted cycloalkoxy, —O—(N-succinimidyl), —NH-adamantyl, —O-cholest-5-en-3-β-yl, —NHOY where Y is hydrogen, alkyl, substituted alkyl, aryl, and substituted aryl, —NH(CH₂)_(p)COOY where p is an integer of from 1 to 8 and Y is as defined above, —OCH₂NR⁹R¹⁰ where R⁹ is selected from the group consisting of —C(O)-aryl and —C(O)-substituted aryl and R¹⁰ is selected from the group consisting of hydrogen and —CH₂COOR¹¹ where R¹¹ is alkyl, and —NHSO₂Z′ where Z′ is alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic; Q is —C(X)NR⁷— wherein R⁷ is selected from the group consisting of hydrogen and alkyl; and X is selected from the group consisting of oxygen and sulfur; and pharmaceutically acceptable salts thereof.
 3. A compound according to claim 1 or 2 wherein R¹ is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heterocyclic, substituted heterocyclic, heteroaryl and substituted heteroaryl.
 4. A compound according to claim 1 or 2 wherein R¹ is selected from the group consisting of methyl, isopropyl, n-butyl, benzyl, phenethyl, phenyl, 4-methyiphenyl, 4-t-butylphenyl, 2,4,6-trimethylphenyl, 2-fluorophenyl, 3-fluorophenyl, 4-fluorophenyl, 2,4-difluorophenyl, 3,4-difluorophenyl, 3,5-difluorophenyl, 2-chlorophenyl, 3-chlorophenyl, 4-chlorophenyl, 3,4-dichlorophenyl, 3,5-dichlorophenyl, 3-chloro-4-fluorophenyl, 4-bromophenyl, 2-methoxyphenyl, 3-methoxyphenyl, 4-methoxyphenyl, 3,4-dimethoxyphenyl, 4-t-butoxyphenyl, 4-(3′-dimethylamino-n-propoxy)-phenyl, 2-carboxyphenyl, 2-(methoxycarbonyl)phenyl, 4-(H₂NC(O)—)phenyl, 4-(H₂NC(S)—)phenyl, 4-cyanophenyl, 4-trifluoromethyiphenyl, 4-trifluoromethoxyphenyl, 3,5-di-(trifluoromethyl)phenyl, 4-nitrophenyl, 4-aminophenyl, 4-(CH₃C(O)NH-)phenyl, 4-(PhNHC(O)NH—)phenyl, 4-amidinophenyl, 4-methylamidinophenyl, 4-(CH₃SC(═NH)—)phenyl, 4-chloro-3-(H₂NS(O)₂—)phenyl, 1-naphthyl, 2-naphthyl, pyridin-2-yl, pyridin-3-yl, pyrimidin-2-yl, quinolin-8-yl, 2-(trifluoroacety 1)-1,2,3,4-tetrahydroisoquinolin-7-yl, morpholin-4-yl, 2-thienyl, 5-chloro-2-thienyl, 2,5-dichloro-4-thienyl, 1-N-methylimidazol-4-yl, 1-N-methylpyrazol-3-yl, 1-N-methylpyrazol-4-yl, 1-N-butylpyrazol-4-yl, 1-N-methyl-3-methyl-5-chloropyrazol-4-yl, 1-N-methyl-5-methyl-3-chloropyrazol-4-yl, 2-thiazolyl and 5-methyl-1,3,4-thiadiazol-2-yl.
 5. A compound according to claim 1 or 2 wherein R² is selected from the group consisting of hydrogen, methyl, phenyl, benzyl, —(CH₂)₂-2-thienyl, and —(CH₂)₂-Φ.
 6. A compound according to claim 1 or 2 wherein R³ is selected from the group consisting of methyl, phenyl, benzyl, diphenylmethyl, —CH₂CH₂—COOH, —CH₂—COOH, 2-amidoethyl, iso-butyl, t-butyl, —CH₂O-benzyl and hydroxymethyl.
 7. A compound according to claim 1 or 2 wherein Q is —C(O)NH— or —C(S)NH—.
 8. A compound according to claim 1 or 2 wherein Ar is aryl or substituted aryl.
 9. A compound according to claim 8 wherein Ar is phenyl or substituted phenyl and x is
 1. 10. A compound according to claim 1 or 2 wherein R⁵ is selected from the group consisting of 3-[(CH₃)₂NC(O)O—]benzyl, 4-[(CH₃)₂NC(O)O—]benzyl, 4-[(CH₃)₂NS(O)₂O—]benzyl, 4-[(piperidin-1′-yl)C(O)O—]benzyl, 4-[(piperidin-4′-yl)C(O)O—]benzyl, 4-[(1′-methylpiperidin-4′-yl)C(O)O—]benzyl, 4-[(4′-hydroxypiperidin-1′-yl)C(O)O—]benzyl, 4-[(4′-formyloxypiperidin-1′-yl)C(O)O—]benzyl, 4-[(4′-ethoxycarbonylpiperidin-1-yl)C(O)O—]benzyl, 4-[(4′-carboxylpiperidin-1′-yl)C(O)O—]benzyl, 4-[(3′-hydroxymethylpiperidin-1′-yl)C(O)O—]benzyl, 4-[(4′-hydroxymethylpiperidin-1′-yl)C(O)O—]benzyl, 4-[(4′-phenyl-1′-Boc-piperidin-4′-yl)—C(O)O—]benzyl, 4-[(4′-piperidon-1′-yl ethylene ketal)C(O)O—]benzyl, 4-[(piperazin-4′-yl)-C(O)O—]benzyl, 4-[(1′-Boc-piperazin-4′-yl )—C(O)O—]benzyl, 4-[(4′-methylpiperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-methylhomopiperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-(2-hydroxyethyl)piperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-phenylpiperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-(pyridin-2-yl)piperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-(4-trifluoromethylpyridin-2-yl)piper-1′-yl)C(O)O—]benzyl, 4-[(4′-(pyrimidin-2-yl)piperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-acetylpiperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-(phenylC(O)—)piperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-(pyridin-4-ylC(O)—)piperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-(phenylNHC(O)—)piperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-(phenylNHC(S)—)piperazin-1′-yl)C(O)O—]benzyl, 4-[(4′-methanesulfonylpiperazin-1′-yl-C(O)O—]benzyl, 4-[(4′-trifluoromethanesulfonylpiperazin-1′-yl-C(O)O—]benzyl, 4-[(morpholin-4′-yl)C(O)O—]benzyl, 3-nitro-4-[(morpholin-4′-yl)—C(O)O—]benzyl, 4-[(thiomorpholin-4′-yl)C(O)O—]benzyl, 4-[(thiomorpholin-4′-yl sulfone)—C(O)O—]benzyl, 4-[(pyrrolidin-1′-yl)C(O)O—]benzyl, 4-[(2′-methylpyrrolidin-1′-yl)C(O)O—]benzyl, 4-[(2′-(methoxycarbonyl)pyrrolidin-1′-yl)C(O)O—]benzyl, 4-[(2′-(hydroxymethyl)pyrrolidin-1′-yl)C(O)O—]benzyl, 4-[(2′-(N,N-dimethylamino)ethyl)(CH₃)NC(O)O—]benzyl, 4-[(2′-(N-methyl-N-toluene-4-sulfonylamino)ethyl)(CH₃)NC(O)O—]benzyl, 4-[(2-(morpholin-4′-yl)ethyl)(CH₃)NC(O)O—]benzyl, 4-[(2′-(hydroxy)ethyl)(CH₃)NC(O)O—]benzyl, 4-[bis(2′-(hydroxy)ethyl)NC(O)O—]benzyl, 4-[(2′-(formyloxy)ethyl)(CH₃)NC(O)O—]benyl, 4-[(CH₃OC(O)CH₂)HNC(O)O—]benzyl, 4-[2′-(phenylNHC(O)O—)ethyl-]HNC(O)O—]benzyl, 3-chloro-4-[(CH₃)₂NC(O)O—]benzyl, 3-chloro-4-[(4′-methylpiperazin-1′-yl)C(O)O—]benzyl, 3-chloro-4-[(4′-(pyridin-2-yl)piperazin-1′-yl)C(O)O—]benzyl, 3-chloro-4-[(thiomorpholin-4′-yl)C(O)O—]benzyl and 3-fluoro-4-[(CH₃)₂NC(O)O—]benzyl.
 11. A compound according to claim 2 wherein R⁶ is selected from the group consisting of 2,4-dioxo-tetrahydrofuran-3-yl (3,4-enol), methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, t-butoxy, cyclopentoxy, cyclopropylmethoxy, neopentoxy, 2-α-isopropyl-4-β-methylcyclohexoxy, 2-β-isopropyl-4-β-methylcyclohexoxy, 2-methoxyphenoxy, 2-(morpholin-4-yl)ethoxy, —O(CH₂CH₂O)₂CH₃, 2-(phenoxy)ethoxy, —OCH₂C(CH₃)₂NHBoc, —NH₂, benzyloxy, —NHCH₂COOH, —NHCH₂CH₂COOH, —NH-adamantyl, —NHSO₂-p-CH₃-Φ, —NHCH,₂CH₂COOCH₂CH₃, —NHOY′ where Y′ is hydrogen, methyl, iso-propyl or benzyl, —O—(N-succinimidyl), —O-cholest-5-en-3-β-yl, —OCH₂—OC(O)C(CH₃)₃, —O(CH₂)_(z)NHC(O)W where z is 1 or 2 and W is selected from the group consisting of pyrid-3-yl, N-methylpyridyl, and N-methyl-1,4-dihydro-pyrid-3-yl, —NR″C(O)—R′ where R′ is aryl, heteroaryl or heterocyclic and R″ is hydrogen or —CH₂C(O)OCH₂CH₃.
 12. A compound selected from the group consisting of: N-(toluene-4-sulfonyl)sarcosyl-L-4-(N,N-dimethylcarbaniyloxy)phenylalanine isopropyl ester N-(toluene-4-sulfonyl)sarcosyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-butyl ester N-(toluene-4-sulfonyl)sarcosyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine N-(toluene-4-sulfonyl)sarcosyl-L-4-(morpholin-4-ylcarbonyloxy)phenylalanine tert-butyl ester N-(toluene-4-sulfonyl)sarcosyl-L-4-(isonipecotoyloxy)phenylalanine N-(toluene-4-sulfonyl)sarcosyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy) phenylalanine tert-butyl ester N-(toluene-4-sulfonyl)-L-N-methylalanyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-butyl ester N-(toluene-4-sulfonyl)sarcosyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine tert-butyl ester N-(toluene-4-sulfonyl)sarcosyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine tert-butyl ester N-(toluene-4-sulfonyl)sarcosyl-L-4-(thiomorpholin-4-ylcarbonyloxy)phenylalanine N-(toluene-4-sulfonyl)-L-N-methylalanyl-L-4-(N,N-dimethylcarbaniyloxy)phenylalanine tert-butyl ester N-(toluene-4-sulfonyl)sarcosyl-L-4-(1,1-dioxothiomorpholin-4-ylcarbonyloxy)phenylalanine N-(toluene-4-sulfonyl)-L-N-methylalanyl-L-4-(N,N-dimethylcarbamyloxy)phenylalamine N-(toluene-4-sulfonyl)-L-N-methyl-2-(tert-butyl)glycinyl-L-4-(4-methylpiperazin-1-ylcarbonyloxy)phenylalanine tert-butyl ester 3-[N-(toluene-4-sulfonyl)-N-methylamino]-1-[1-carboxy-2-(N,N-dimethylcarbamyloxy)phenylethyl]azetidine N-(toluene-4-sulfonyl)-L-prolyl-L-4-(isonipecotoyloxy)phenylalanine tert-butyl ester N-(methanesulfonyl)-N-benylglycinyl-L-4-(N,N-dimethylcarbamyloxy)phenylalanine tert-butyl ester and pharmaceutically acceptable salts thereof as well as any of the ester compounds recited above wherein one ester is replaced with another ester selected from the group consisting of methyl ester, ethyl ester, n-propyl ester, isopropyl ester, n-butyl ester, isobutyl ester, sec-butyl ester, tert-butyl ester and neopentyl ester.
 13. A method for binding VLA-4 in a biological sample which method comprises contacting the biological sample with a compound of claim 1 or 2 under conditions wherein said compound binds to VLA-4. 